Final answer:
Most comets are believed to originate from the Oort cloud, which is the source of long-period comets, and the Kuiper belt, associated with short-period comets or Jupiter-family comets.
Explanation:
It is believed that most comets originate from two primary regions in our solar system: the Oort cloud and the Kuiper belt. The Oort cloud is an extensive shell of icy objects that lies far beyond Pluto, enveloping the solar system out to about 50,000 astronomical units (AU) from the Sun. This distant reservoir contains trillions of cometary nuclei and is the source of long-period comets, which can have orbits lasting hundreds or even thousands of years.
On the other hand, the Kuiper belt is a disk-shaped region beyond Neptune, extending to approximately 50 AU. It is made up of ice-and-rock planetesimals, which are remnants of the building blocks of the planets. This area is the origin of short-period comets, typically called Jupiter-family comets, which have shorter orbits lasting less than 200 years due to gravitational interactions with the giant planets, especially Jupiter.
While the Oort cloud is believed to house the majority of comets in the solar system, the Kuiper belt is responsible for a significant number of observable comets, including some that have been the target of spacecraft missions. Therefore, in response to the original question, it's important to recognize that both B) Oort cloud and C) Kuiper belt are sources of comets, but the Oort cloud is considered the primary reservoir for most comets.
If a plant's flowers are very colorful and produce nectar, the plant is probably pollinated by ______________. self-pollination insects wind water
Answer:
insects
Explanation:
insects are usually attracted by very colorful flower and flowers with good scent and most of this flowers are usually pollinated by insects.
Insects are usually attracted to flowers with nectar because of the sweet juices produced at the nectar
Answer:
Explanation:
The plant can be pollinated by bees because bees are attracted to plants that have nectar and lovely scent. Thy can move from one flower to another.
We have different pollinators like
Bats
Insects
Animals
Wind
Water
A newly discovered animal reproduces slowly. It has only one offspring each time it reproduces. Which reproductive strategy does this organism use?
A. r-strategy
B. carrying captivity
C. K-strategy
D. endangered(I don't believe this one is the answer)
Answer:
C: K Strategy
Explanation:
The best choice will be C- K strategy because this type of strategy involves greater investment from parents into their offspring. These organisms are mostly higher organisms which reproduce slowly and ensure the maximum survival of their offspring. They compete strongly with other organisms and invest more in their survival by producing fewer quality offspring that have more survival opportunities.
Example of K-selected species include larger mammals (such as primates and horses), birds and larger plants. Unlike their opposite R-selected specie which produce large number of offspring, K selected specie are called in Equilibrium wile R-selected species are called as opportunistic.
Thank you!
A newly discovered animal that reproduces slowly and has only one offspring each time indicates a K-strategy reproductive strategy, where fewer, larger offspring receive more resources and parental care for better survival prospects in stable environments. Hence, the correct option is C.
The newly discovered animal that reproduces slowly and has only one offspring each time it reproduces employs a K-strategy reproductive strategy. This strategy is characterized by having fewer, larger offspring and investing a significant amount of resources and parental care to ensure the survival of each offspring. This is in contrast to the r-strategy, where species reproduce quickly and in large numbers, but with each offspring having a lower probability of survival. K-strategists are often found in stable, predictable environments where populations tend to be close to their carrying capacity, such as elephants, lions, and whales. These species benefit from a close adaptation to the conditions of their environment, leading to long life spans, later breeding, and stable populations close to the carrying capacity (K).
After a major forest fire, the process of succession begins in an ecosystem.
Which best describes how succession changes the ecosystem?
O
A. The ecosystem becomes more stable and diverse.
O
B. The ecosystem becomes more disturbed.
O
C. The ecosystem has fewer species.
O
D. The ecosystem has less biodiversity.
SUBMIT
Answer:
The ecosystem becomes more stable and diverse.- A.
The best answer is:A. The ecosystem becomes more stable and diverse.
As the process of succession occurs, the ecosystem becomes more stable and diverse. This is because different species colonize the area at different stages of succession, leading to an increase in the number and diversity of species present.
Thus, While succession can be seen as a disturbance in the short term, in the long term, it leads to greater stability and biodiversity in the ecosystem. Therefore, options B, C, and D are not correct.
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Mendel imagined that seed color in pea plants is influenced by a gene with two alleles in which the allele for yellow seeds (y) is dominant over the allele for green seeds (y). what would mendel predict the seed colors would be from a cross of a male plant with the mixed yy genotype with a female plant with the yy genotype?
Final answer:
Mendel's prediction for the offspring's seed color from a cross between a heterozygous yellow (Yy) and a homozygous green (yy) pea plant would result in a 1:1 ratio of yellow to green seeds, with 50% being heterozygous yellow (Yy) and 50% being homozygous green (yy).
Explanation:
Gregor Mendel imagined that seed color in pea plants is influenced by a gene with two alleles, with the allele for yellow seeds (Y) being dominant over the allele for green seeds (y). When crossing a male plant with a heterozygous genotype (Yy) with a female plant with a homozygous recessive genotype (yy), Mendel would predict the following possible genotypes in their offspring: Yy and yy.
Using a Punnett square to predict this cross's outcome, the resulting genotypes in the F₁ generation would be a 1:1 ratio of heterozygous yellow (Yy):homozygous green (yy). Phenotypically, this would lead to a 50% chance of offspring with yellow seeds and a 50% chance of offspring with green seeds. This principle follows Mendel’s law of segregation, stating that the alleles for a trait separate during gamete formation and recombine at fertilization, producing varying genotypes and phenotypes in the offspring.
1. Which of the following is NOT a characteristic that mining companies look for when determining if an area is worth mining?
a. Rock color
b. Radioactivity
c. Vegetation
d. Magnetism
2. You are a geologist testing to make sure that waste from a nuclear power plant is not leaking into a nearby farmer’s field. You will be testing for unstable, decaying nuclei. What are you testing for and how will you detect it?
a. You will test for radioactivity by using a microscope.
b. You will test for magnetism by using a Geiger counter.
c. You will test for fluorescence by using a barometer.
d. You will test for radioactivity by using a Geiger counter
3. We can use cow dung (feces) as a form of biomass.
a. True
b. False
4. The following equation is balanced correctly. H2 + O2 --> H2O
a. True
b. False
5. Using the periodic table, which of the following is an isotope?
a. Zn – 68
b. Cs - 133
c. Tb – 159
d. C – 12
1. A 2. C 3. A 4. B 5. D
Answer:
1. C Vegetation
2. D Geiger Counter
3. A True
4. B False
Explanation:
1. Rock color, Radioactivity and magnetism are important characteristics to determine the kind of mineralization and if it is economically viable.
2. Geiger Counter is a device that is used to detects alpha, beta or gamma rays through ionization of the radiation
3. 2H2 + O2 = 2H2O + Energy
4. Carbon-12 is an isotope of carbon, carbon-13 and carbon-14 are also the isotopes of carbon
Describe why seed dormancy is a valuable adaptation that has helped explain the evolutionary success of seed plants
Seed dormancy allows for a seed to germinate only when the conditions are right to support the germination and growth of the plant. This adaptation, therefore, increases the chances of survival for the plant. Natural selection, which powers evolution, will always favor desirable traits which will be entrenched in a population through successive generations.
Consider two very distantly related species, Species A and Species B. These species live in distinct but similar environments and share a trait that improves their survival and reproduction in their respective environments. Which of the following is the most likely reason that Species A and Species B share this trait? descent from a common ancestor gene flow convergent evolution genetic drift
Answer:
convergent evolution
Explanation:
If we have two species that share a similar trait or look alike a lot, but they live in places isolated from each other, and they only have a very distant relation, then it is a case of convergent evolution. This type of evolution occurs with species that are not closely related, but they live in environments where having the same or very similar traits is advantageous. This can often lead to a confusion when looking at the species only on the outside, and it can be very misleading. As an example we can take the sabretoothed predators that existed in the past. Both the smiloden and the thylacosmilus had large saber like teeth, and even their bodies looked very similar, so one would assume that they are closely related, but that was not the case. The smilodon was part of the cat family, while the thylacosmilus was a marsupial, making them very distantly related. They developed same same and some very similar traits because their environment created the evolutionary pressure for those traits to develop as they were advantageous, despite them evolving in totally different places and separately.
Michaela is starting a farm and wants to ensure that the soil will hold enough moisture for her crops. Which strategy would most likely help her to retain soil moisture? 1Points A find a farm with sandy soil B farm an area with a deep soil layer C increase the size of the particles D plant crops with larger seeds
Answer:
A. find a farm with sandy soil
Explanation:
Sandy soil helps keep moisture retention
In order to retain moisture, the farmer must farm an area with a deep soil layer.
Soil refers to the outermost layer of the earth's crust on which plants grow. The soil supports the growth of plants as well as retains moisture for the plants. This moisture is very necessary for plant growth.
However, sandy soil does not retain moisture because it is porous. In order to retain moisture, the farmer must farm an area with a deep soil layer.
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Cells of a fungus and an animal were being studied. which of these would be found in both of these cells?
Mitochondria (btw, the exact question is online if you type it in.)
Fungal and animal cells both contain a nucleus, mitochondria, plasma membranes, and ribosomes, despite differences such as the presence of a cell wall in fungal cells containing chitin.
Both fungal and animal cells share several structures despite their differences. Cells of a fungus and an animal both contain a nucleus, where genetic material is stored and cellular activities are regulated. Additionally, both types of cells possess mitochondria, the energy-producing organelles often referred to as the powerhouses of the cell. Both also have plasma membranes that regulate the movement of substances into and out of the cell, although the specific compositions differ, with fungi having ergosterol instead of cholesterol. While fungi do have a cell wall composed of chitin, animals do not possess a cell wall, but instead have an extracellular matrix. Importantly, ribosomes are present in both animal and fungal cells and are responsible for protein synthesis. In summary, the nucleuses, mitochondria, plasma membranes, and ribosomes can be found in both fungal and animal cells.
How many chromosomes are found in human gametes
Answer: Humans have 23
Place the following in order from highest to lowest expected partial pressure oxygen levels.
• Cells of systemic tissues
• Atmospheric air
• Systemic capillaries
• Pulmonary capillaries
• Alveoli of lungs
Final answer:
The expected partial pressure oxygen levels in order from highest to lowest are: Alveoli of lungs, Pulmonary capillaries, Systemic capillaries, Cells of systemic tissues, Atmospheric air.
Explanation:
In terms of expected partial pressure oxygen levels, the order from highest to lowest would be:
Alveoli of lungs - Partial pressure of oxygen in the alveoli is about 104 mm Hg.Pulmonary capillaries - Partial pressure of oxygen in the blood of the capillary is about 40 mm Hg.Systemic capillaries - Partial pressure of oxygen in the systemic tissues is about 40 mm Hg.Cells of systemic tissues - Partial pressure of oxygen in the tissue cells is about 40 mm Hg.Atmospheric air - Partial pressure of oxygen in the atmospheric air is about 21% (not given in mm Hg).Marsupials are found in north america and australia. True or False
Answer:
True
According to UCMP Berkley, the only naturally occurring marsupial in the North America is the opossum (of different varieties).
Australia has a variety of marsupials, including the Tasmanian Devil, wombat, koala, and Red Kangaroo.
The dna that results from replication consists of
Answer: The result of DNA replication is one old chain and one new nucleotides.
Explanation:
DNA replication usually occurs in living organisms and is process that involves the production or synthesis of two identical DNA replicas from old DNA molecule during cell division. Thus, DNA replication usually starts a specific location in the genome and each strands from the original DNA usually serves as template for the synthesis counterpart DNA known as semi-conservatives replication. However, the result of DNA replication is semi-conservatives replication which is made up of one old chain and one new nucleotides.
One way in which the anabolism of pyrimidine nucleotides differs from that of purine nucleotides is that
a) the pyrimidine ring is assembled before being bonded to the ribose phosphate, whereas the purine ring is bonded to the ribose phosphate as it is formed
b) there is no feedback inhibition in the anabolism of pyrimidine nucleotides, while feedback inhibition is important in the synthesis of purine nucleotides
Answer:
a) the pyrimidine ring is assembled before being bonded to the ribose phosphate, whereas the purine ring is bonded to the ribose phosphate as it is formed
Explanation:
There are two ways for the synthesis of purines and pyrimidines:
de novo synthesis-from basic simple units"recycling" synthesis-reuse of metabolitesPurines are synthesized directly on ribose sugar, in segments.
Pyrimidines are attached to the ribose after the synthesis of the base.
Ddt is harmful to the environment because it
What do you mean with “ddt” ?
How many unique gametes could be produced through independent assortment by an individual with the genotype aabbccddee?
Answer:
Only one
Explanation:
This is because genotype aabbccddee is homozygous for all loci.
The law of independent assortment is Mendel's fourth postulate which states that alleles of different genes are independently of one another assorted into gametes during meiosis. So, if we observe two traits, for example pea color (gene A) and pea shape (gene B), the alleles A and a will separate independently of alleles B and b.
So, in the example above, the only possible gamete is abcde.
How does a pluripotent cell differ from a totipotent cell?
A. Pluripotent cells disappear after a baby is born.
B. Pluripotent cells can be used in adults but not children.
C. Pluripotent cells can only turn into one kind of specialization.
D. Pluripotent cells can't give rise to placental cells.
Answer:
D. Pluripotent cells can't give rise to placental cells.
Explanation:
Stem cells are the cells which have the ability to divide and differentiate into many types of cell and at the same time get self renewed.Pluripotent stem cells are a category of stem cells that have the ability to form all the cells except the placental cells and the embryo.The stem cells that can from the placenta and give rise to the embryo are known as totipotent cells.Combinatorial control refers to a regulatory mechanism in which:each alternatively spliced transcript has a different combination of exons.None of the answer options is correct.transcription is terminated by a combination of sites in the terminator.transcription is initiated by a combination of sites in the promoter.transcription requires a specific combination of transcription factors.
Answer:
transcription requires a specific combination of transcription factors
Explanation:
Combinatorial control refers to a regulatory mechanism in eukaryotic transcription that involves several transcriptional factors. Simply saying, in eukaryotes, expression of a gene is controlled by specific combinations of transcriptional factors. This also means that one factor can be involved in regulation of two distinct genes but in combination with different other factors.
Combinatorial control is one of the examples which shows the complexity of gene regulation in eukaryotes over the prokaryotes.
DDT (dichlorodiphenyltrichloroethane) is a manmade pesticide that was designed to kill insects that carried diseases. However, the pesticide was found to cause mutations to both body cells and sex cells in other organisms. Because of this, DDT is now banned in most countries around the world.
How are mutations to reproductive cells, or gametes, different than mutations to other cells in the body?
I. Mutations to reproductive cells can be passed on to offspring.
II. Mutations to body cells can be passed on to offspring.
III. Mutations to body cells are more harmful than mutations to reproductive cells.
IV. Mutations to reproductive cells are usually beneficial to offspring.
--
A.
I, II, and III only
B.
II and III only
C.
I, II, III, and IV
D.
I only
Answer:
I. Mutations to reproductive cells can be passed on to offspring.
Explanation:
Option B) Mutations in reproductive cells can be inherited by offspring, while mutations in body cells only affect the individual.
Mutations to reproductive cells, or gametes, are different from mutations to other cells in the body because only mutations to reproductive cells can be passed on to offspring. When mutations occur in somatic cells (non-reproductive cells), they affect only the individual in which they occur and are not inherited by future generations. However, mutations in reproductive cells can be transmitted to offspring during reproduction, potentially leading to genetic disorders or other hereditary traits.
The statement "Only mutations to reproductive cells can be passed on to offspring" accurately reflects this distinction. The other options presented are not accurate representations of the differences between mutations in reproductive cells and mutations in other cells in the body.
Complete Question:
Which of the following is the best example of an abiotic factor limiting population size?
A) the amount of aquatic plants eaten by snails in a pond
B) the number of dead standing trees available as nesting sites for downy woodpeckers
C) the spread of deadly human flu virus from one person to another by touching and sneezing
D) the frequency of rainfall needed for the germination of desert plant seeds
Answer:
D) the frequency of rainfall needed for the germination of desert plant seeds
Explanation:
When we talk about abiotic factors, we refer to the non-living factors. The abiotic components of an ecosystem include: Water, air, temperature, light, and the like.
So if we consider it as a limiting factor to population size, this should be the cause of the limitation.
Among all the choices, only D, shows an abiotic factor being the cause of population limiting. Rainfall is an abiotic factor (water), which influences the germination of desert plant seeds, specifically, it depends on the frequency of rainfall.
Both a toothbrush and a car are examples of technology. Explain why both are considered technology.
Final answer:
A toothbrush and a car are considered technology because they are practical applications of scientific knowledge that impact daily life, whether through improved oral hygiene or transformed transportation.
Explanation:
Both a toothbrush and a car are examples of technology because they embody the application of scientific knowledge and engineering for practical purposes that enhance our daily lives. The toothbrush, which evolved from a simple twig used by ancient peoples to the high-tech electric versions today, showcases the refinement of design and effectiveness for maintaining oral hygiene. Cars, on the other hand, have revolutionized transportation, enabling faster movement and altering the social and physical landscape through the development of roads and urbanization.
Technology profoundly impacts our everyday life by introducing efficiencies and conveniences that were previously impossible. The electric toothbrush, for example, was invented in 1939 and became more popular in the 1990s, while the microwave oven, originating from World War II radar technology in 1946, has become a staple in heating and preparing food rapidly. These inventions and many others have transformed our routines and the very way society operates.
The health status of the American population is poor in international comparison, which is evidence that all the spending on medical care cannot compensate for failures in the public health system. True or False
Answer:
rhwrthwrht
Explanation:
wrthwrthrtherjerjetjeyj
Use the following words and phrases to answer the questions below with the best possible answer. Some phrases will be used MORE than once.
Succession Primary Succession Secondary Succession
Soil Climax Community Pioneer Species
1. A forest of pine trees is burned over a 10 mile area when lightning strikes a tree. In the spring, a few seedlings begin to sprout. This is an example of:
2. A glacier has scraped all soil from a rocky area. As it slowly retreats, some of the rock is broken down by weathering. Some moss begins to grow. This is an example of:
3. An old-growth forest has remained the same combination of hickories and oaks for 100 years. This is an example of a:
4. Small organisms, such as lichens, help break up bare rock into soil. A lichen is an example of a:
5. A pond slowly fills in as algae and other plants die and fall to the bottom. This is an example of:
6. A volcano erupts creating a new island. This is an example of:
7. The process of primary succession begins with the formation of _________. Over time the once empty rock surfaces will become populated with organic material.
8.______________ occurs when ecosystems change over time through the progressive replacement of species.
1. secondary succession
2. primary succession
3. climax community
4. pioneer species
5. secondary succession
6. succession
7. N/A
8. N/A
im doing this rn too lol, i only have a few i need help with 7. hopefully someone else has 7&8 but these are real answers 100% !
1. A forest of pine trees is burned over a 10 mile area when lightning strikes a tree. In the spring, a few seedlings begin to sprout is example secondary succession.
What is secondary succession?Secondary succession is defined as the which occurs when the severity of disturbance is deficient to remove all the existing vegetation and soil from a site.
2. Primary succession example a glacier has scraped all soil from a rocky area. As it slowly retreats, some of the rock is broken down by weathering. Some moss begins to grow.
Primary productivity is defined as the process through which organisms form their own food from inorganic sources. The majority of primary producers are microbial life and terrestrial plants, such as algae.
3. An old-growth forest has remained the same combination of hickories and oaks for 100 years. This is an example of a climax community. A climax community is defined as the final stage of succession, remaining relatively unaltered until destroyed by an event such as human or fire interference.
4.Small organisms, such as lichens, help break up bare rock into soil. A lichen is an example of a pioneer species. Pioneer species is the first biotic community that develops in bare/scanty area.
5. A pond slowly fills in as algae and other plants die and fall to the bottom. This is an example of secondary succession.
6. A volcano erupts creating a new island. This is an example of succession.
7. Primary succession begins with no soil. Lichens and mosses eventually develop and die, leaving behind some soil. This soil is used by small plants like grasses and some ferns to flourish.
8. Primary succession occurs when ecosystems change over time through the progressive replacement of species.
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Which of the following types of cells display the property of electrical excitability?a) Muscle cellsb) Neuronsc) All of these choicesd) None of these choices
Answer:
Answer is both
Explanation:
Muscles cells get excite when they get impulse Ca++ ions are involve in it.
Neurons are also excitalble. And Na+ ions involve in it.
Muscle cells and neurons, both types of cells display the property of electrical excitability, hence option C is correct.
How neurons are electrical excited?Neurons' resting membrane potential lies between -40 and -90 mV. The majority of cells in the body, including those that are polarized, have an imbalance of charges across their membranes. They also display membrane potentials.
Rheobase and chronaxie are two variables that express the muscle's excitability. The rheobase is the maximum amount of electric current that can excite tissue no matter how long it is applied.
Chronaxie, on the other hand, is the length of time needed to excite a tissue when the stimulus' strength is double that of the rheobase.
Therefore, muscle cells and neurons, both types of cells, display the property of electrical excitability.
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By what process does oxygen move from the alveoli into the blood of the pulmonary capillaries?
Answer:
Diffusion
Explanation:
Diffusion is a simple process of molecules' movement, from their higher concentration to he area with their lower concentration. The process of oxygen movement from the alveoli into the blood of the pulmonary capillaries is called gas exchange and it is actually simple diffusion. Alveoli have huge surface area, thin cell walls and a lot of blood vessels around them. All of these are adaptations that facilitate gas exchange. There is a high oxygen gradient: oxygen concentration in the alveoli is much higher (inhaled air) than in the surrounding capillaries so oxygen moves down its gradient-from the alveoli to the blood.
A closed circulatory system is one in which _______________
Answer:
A closed circulatory system is one in which blood flows though a system of blood vessels throughout the body.
Consider this animal cell. Which organelles are labeled G? a) centrioles b)lysosomes c)endoplasmic d)reticulum-mitochondria
The organelles are labeled as reticulum-mitochondria.
What are organelles?Inside cells, organelles were specialized structures that carry out a variety of tasks. Literally, the phrase refers to "tiny organs." Organelles provide specialized functions to keep a cell alive, much like organs like the heart, liver, stomach, as well as kidneys, which serve different functions to keep an individual alive.
What are mitochondria?The majority of eukaryotic creatures contain a double-membrane-bound organelle known as a mitochondrion. The majority of the cell's adenosine triphosphate, which is being used as a source of chemical energy all across the cell, has been produced by mitochondria using aerobic respiration.
Therefore, the organelles are labeled as reticulum-mitochondria.
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Tom designs bath time toys. Which modification will help him improve the performance of water squirting whales? A) Larger hole B) Harder plastic C) Smaller whale body D) Thicker, more flexible material
The correct modification to improve water squirting whale toys is A) Larger hole, as it would likely increase the flow rate of the water being squirted out based on fluid dynamics principles.
The student asked which modification will help improve the performance of water squirting whales. To enhance the performance of water squirting toys, a key factor to consider is the ease and speed with which water can be expelled from the toy. In the context of fluid dynamics, the size of the outlet where the water is expelled plays a crucial role. A larger hole (option A) at the water expulsion point would likely increase the flow rate of the water being squirted out, provided the force applied is consistent. This is supported by principles such as Bernoulli's equation, which relates the speed of a fluid to its dynamic pressure and cross-sectional area. Therefore, the correct answer is A) Larger hole.
The theory that too much money in the economy causes inflation is referred to as the
Answer:
Classical inflation theory, also known as quantitative theory of money.
Explanation:
In economics, several theories try to explain what generates inflation. One is the quantitative theory of money. Also called the classical theory, the quantitative theory of money is associated with a strand of economists called monetarists.
The quantitative theory of money relates to inflation the amount of money in an economy. According to theory, the amount of money available determines the price level in an economy. And in turn, the growth rate of the amount of money determines the rate of inflation.
Within this view, there is a balance between money supply and demand in an economy at a given productive level. If there is a change in this supply and demand for money without changes in the productive capacity of this economy there will be a price change.
Which of the following is an example of a feedback loop in the body?
A.
The pancreas can be endocrine and exocrine.
B.
The nervous system sends a signal to produce hormones.
C.
The body produces adrenaline when a person is scared.
D.
The thyroid gland reverses the action of the parathyroid gland.
The correct answer is D because this helps it maintain homeostasis
The feedback loop is the mechanism of product amplification or inhibition. The thyroid gland switches the activity of the parathyroid gland is an example of the feedback loop.
What is a Feedback loop?The product of the biological reactions enhances the overall reaction system or can inhibit the system reaction. They can be positive and negative feedback loops.
The feedback mechanism checks and regulates homeostasis and thermoregulation of the body. In the human body, the thyroid and the parathyroid gland acts and produces hormones based on the feedback mechanism.
Therefore, option D. production of the thyroid gland inhibits and reverses the action of the parathyroid glands.
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