Answer:
True
Explanation:
A population of cheetahs has a birth rate of 5 and a death rate of 15. Immigration is 2, and emigration is 4. What is its population growth? –14 –12 12 14
The answer is -12
Starting with a base of 0 cheetahs:
5 are born (0+5=5)15 die (5-15=-10)2 come (-10+2=-8)4 leave (-8-4=-12)After everything happens, the cheetah population has overall lost 12 cheetahs.
The population growth rate is -12. Therefore, option (B) is correct.
What is population growth rate?Population growth rate is a measure of the change in the size of a population over a given period of time, usually expressed as a percentage. It is calculated by subtracting the number of deaths and emigrants from the number of births and immigrants within a given time period, and dividing this result by the initial population size. The resulting number indicates whether a population is growing, declining, or remaining stable over time.
A positive growth rate means that the population is increasing, while a negative growth rate means that the population is decreasing. Population growth rate is an important indicator of the sustainability of a population and can have significant social, economic, and environmental implications.
To calculate the population growth rate, we need to subtract the death rate and emigration from the birth rate and immigration:
Population growth rate = (birth rate + immigration) - (death rate + emigration)
Plugging in the given values, we get:
Population growth rate = (5 + 2) - (15 + 4)
Population growth rate = 7 - 19
Population growth rate = -12
Therefore, the population growth rate is -12.
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What are the pros and cons of transect sampling?
Hello again!
PRO: Transects are used when you wish to illustrate a particular gradient or linear pattern along which communities of plants and, or animals change. They provide a good way of being able to clearly visualize the changes taking place along the line. Depending on how detailed the line transect is, they can usually be accomplished fairly quickly.
CON:Literally the exact opposite.
Welcome :D
Answer:
read
Explanation:
pros -
They provide a good way of being able to clearly visualize the changes taking place along the line.Depending on how detailed the line transect is, they can usually be accomplished fairly quickly.It can be used to monitor a change in an area over time.cons -
It is not always easy to identify where best to undertake the transect walk, the transect may actually not represent a common picture of the area/ community. It’s often not representative of all the organisms in the habitat.The peripheral nervous system _____
A. consists of all body nerves
B. Includes the brain and spinal cord
C. Is composed of two types; somatic and autonomic
D. Is subdivided into four parts
Answer:
A. consists of all body nerves
Explanation:
The peripheral nervous system consists of all body nerves.
Which nutrients contain nitrogen in addition to carbon hydrogen, and oxygen? A) vitamins. B) proteins. C) carbohydrates. D) fat
Answer:
B
Explanation:
Proteins contains nitrogen, including carbon, oxygen, and hydrogen
Drag the tiles to the boxes to form correct pairs.
Match the structures of the male reproductive system to their functions.
seminal vesicles
testes
scrotum
penis
epididymis
protection and temperature maintenance of the testes
storage and maturation of sperm
production of sperm and testosterone
delivery of sperm to female reproductive system
production of fluid that nourishes sperm
Answer:
Matched functions of structures of male reproductive system are:
Semi vesicles: Production of fluid that nourishes sperm
Testes: Production of sperm and testosterone
Scrotum: Protection and temperature maintenance of the testes.
Penis: Delivery of sperm to female reproductive system
Epididymis: Storage and maturation of sperm
Answer:
Seminal Vesicles - production of fluid that nourishes sperm
testes - production of sperm and testosterone
scrotum - protection and temperature maintenance of the testes
penis - delivery of sperm to female reproductive system
epididymis - storage and maturation of sperm
Explanation:
Seminal vesicle - It is a pair of accessory gland present in male reproductive system along with other glands called prostate gland and cowper's gland. It is tube like, coiled structure and lies behind the bladder. The main part of the ejaculate is due to the secretion of viscous fluid from seminal vesicle. It contains fructose, citric acid, inositol and prostaglandins.
Testes - These are situated outside the abdominal cavity in a sac like structure called scrotum. It is the primary reproductive organ involved in production of sperms and the male androgen called testosterone.
Scrotum - It helps to maintain the lower temperature of the testes which is needed for spermatogenesis i.e. synthesis of sperms. Testes descends into the scrotal sac during the 7th month of fetal development.
Penis - delivery of sperms occurs through penis, an erectile copulatory organ. It helps in depositing the semen into the female reproductive system. It is the male external genitalia and is made up of spongy tissue.
Epididymis - It is the place where sperms are stored temporarily. It is an extratesticular duct system where maturation of sperms occur.
Index fossils are fossils of organisms that ____.
Question 6 options:
lived over a short period of time
are not easily recognized
are not widely distributed geographically
are scarce
Answer:
They were spread over a wide area, and lived over a short period of time
Explanation:
Index fossils are fossils that are used to date back geologically.
Answer: Option (1)
Explanation: Index fossils are those fossils which were present only for a short period of time and had wide geographical distribution. This fossils plays an important role in the correlation of rocks i.e two same rocks appearing at two different places, as well as, it helps in the determination of the age of rock. For example, ammonites.
Thus, the correct answer is option (1).
Lily is researching the light-sensing rod cells of the eye. She decides to use stem cells to produce new rod cells. Which statement best explains why Lily is using stem cells for this purpose?
A. Specific genes in a rod cell’s DNA can be activated to produce new stem cells.
B. Specific genes in a stem cell’s DNA can be activated to produce new rod cells.
C. All genes in a rod cell’s DNA are activated, so new stem cells are produced each time the cell divides.
D. All genes in a stem cell’s DNA are activated, so new rod cells are produced each time the cell divides.
E. None of the genes in a rod cell’s DNA are activated, so new rod cells can be produced only from stem cells.
Answer:
answer is b
Explanation:
Lily is researching the light-sensing rod cells of the eye, and she decides to use stem cells to produce new rod cells because specific genes in a stem cell’s DNA can be activated to produce new rod cells, which is presented in Option B.
What is the importance of the stem cell in an individual?The stem cell is more undifferentiated than the differentiated cell type, and when stimulated, it can produce a specific cell type, such as when the rod cell stimulus is applied, the rod cell genes are activated, and the stem cell can produce the rod cell, and based upon the types, there are many types of the stem cell.
Hence, Lily is researching the light-sensing rod cells of the eye, and she decides to use stem cells to produce new rod cells because specific genes in a stem cell’s DNA can be activated to produce new rod cells, which is presented in Option B.
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Which of the following would have the greatest effect on natural selection within a geographically isolated population of elephants?
A. DNA replication
B. availability of resources
C. formation of gametes
D. average life expectancy
Select the situation bellow that would produce a total Displacement of zero. A. A trip to the moon and then to Mars B. A horse galloping from one end of a field to another C. The criss-crossing path of a bug as it flies from flower to flower D.A round-trip ride to school and back
Answer:
D.A round-trip ride to school and back
Explanation:
A round-trip ride to school and back would produce a total Displacement of zero.
You start and stop at the same place.
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A red blood cell placed in pure water would ________.
Hello There!
A red blood cell placed in pure water would "BURST"
This is because water would move in the red blood cell and become hypotonic. It does not have enough space so thats why it bursts.
A red blood cell placed in pure water would undergo hemolysis, leading to the swelling and bursting of the cell.
When a red blood cell is placed in pure water (a hypotonic solution), water molecules move into the cell through the process of osmosis. Red blood cells contain a semi-permeable membrane that allows water to pass through but restricts the movement of larger molecules and ions.
As water molecules enter the cell, the concentration of water inside the cell increases compared to the surrounding solution. This causes the cell to swell and expand as it tries to equalize the concentration of solutes inside and outside the cell.
However, red blood cells have a finite capacity to expand due to the rigidity of their membrane. When the cell swells beyond its limit, the cell membrane eventually ruptures or bursts, leading to the release of cellular contents into the surrounding environment. This process is known as hemolysis.
Hemolysis can be detrimental in certain medical conditions, such as in cases of severe water intoxication or when patients are administered hypotonic intravenous fluids. In contrast, if a red blood cell is placed in a hypertonic solution (one with a higher solute concentration than inside the cell), it would undergo crenation, where water moves out of the cell, causing it to shrink and become distorted. Maintaining the proper balance of water and solutes is crucial for the normal functioning and integrity of red blood cells and other cells in the body.
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Rory uses a battery to power a light bulb with a resistance of 10 ?. If 0.15 A of current is flowing, what is the voltage of the battery?
Answer:
V=IR
Explanation:
V=0.15 x 10
V= 1.5V
The voltage of the battery is 1.5V.
A=0.15A
V=IR
V=0.15 x 10
V= 1.5V.
What is voltage in simple terms?
Voltage moves the charge. It is "thrust" that causes the charge to move through the wire or other conductor. You can think of it as the force that drives the charge, but it is not the force. Voltage can cause an electric current because the electric charge can move an electric charge and the electric charge that moves is an electric current. It can be concluded that n does not have such properties and is derived by evolution.
Voltage, also called electromotive force, is simply energy per unit charge. In other words, voltage is the potential difference between two points. Current is just the flow rate of electric charge
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Maintaining an internal body temperature is one of the key components to maintaining homeostasis. ____________________ involves cooling the body down by bringing more blood to the capillaries on the surface of the skin where the heat can be lost. ___________________ involves shutting down those capillaries so less heat can be lost and the body can warm.
Answer:
B) vasodilation and vasoconstriction
Explanation:
What is the purpose of chloroplasts?
Answer:
Chloroplasts are the food producers of the cell. They are only found in plant cells and some protists. Animal cells do not have chloroplasts. Every green plant you see is working to convert the energy of the sun into sugars. Plants are the basis of all life on Earth. They create sugars, and the byproduct of that process is the oxygen that we breathe. That process happens in the chloroplast. Mitochondria work in the opposite direction and break down the sugars and nutrients that the cell receives.
Explanation:
Answer:
Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells. The entire process is called photosynthesis and it all depends on the little green chlorophyll molecules in each chloroplast. Plants are the basis of all life on Earth. They are classified as the producers of the world.
which term best describes a community in which people work mostly in factories?
A.agricultural.
B.hunting and gathering.
C.domesticated.
Industrial.
Answer:
Industrial
Explanation:
Industrial is generally used to description under the term of industry, which would imply that people worked with the necessary things within that said industry, generally involving equipment, produced in factories.
Note however, that while factories fall under industrial, industrial includes more than just factories.
~
Answer:
It's Industrial
Explanation:
This right
What is the starting point in replication called
Final answer:
The starting point in DNA replication is termed the origin of replication, which is a specific nucleotide sequence recognized by certain proteins initiating the unwinding and synthesis of DNA.
Explanation:
The starting point in DNA replication is known as the origin of replication. In prokaryotes, such as E. coli, the origin is a specific sequence on the chromosome which is recognized by certain proteins, with helicase playing a critical role in unwinding the DNA. In eukaryotes, there are multiple origins of replication allowing replication to occur simultaneously at several places in the genome. The process includes the formation of a replication fork, with DNA polymerases synthesizing the new strands in the 5'-3' direction, leading to the creation of leading and lagging strands.
What is produced during the Krebs cycle?
CO2, ATP, NADH, and FADH2
Pyruvate, CO2, and ATP
ATP, FADH2, and H2O
H2O, ADP, and NADH
Answer:
CO2 and ATP
Explanation:
A cell begins to send out in correct chemical signals to neighboring cells during which phase of the cell cycle did the cause of the change most likely happen?
Answer:
S-phase
Explanation:
S-phase is the part of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase. Precise and accurate DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease
Answer:
S-Phase of the cell cycle
Explanation:
All the cells send chemical signals during the S phase of the cell division. Basically in this phase of cell cycle, the cell synthesizes and replicates DNA. It is the phase that occurs during the inter phase of the cell cycle just before the mitosis or meiosis.
The cell in the s phase communicates this to its neighboring cells in order to prepare them too for cell division.
What is the main function of the rough endoplasmic reticulum?
Answer: Ribosomes on the rough endoplasmic reticulum are called 'membrane bound' and are responsible for the assembly of many proteins. This process is called translation. Certain cells of the pancreas and digestive tract produce a high volume of protein as enzymes.
source:
https://bscb.org/learning-resources/softcell.../endoplasmic-reticulum-rough-and-smooth/
The rough endoplasmic reticulum's primary function is the synthesis and modification of proteins. Once synthesized, these proteins are transported to the Golgi apparatus for further processing and distribution.
Explanation:The main function of the rough endoplasmic reticulum (ER) is the synthesis and modification of proteins. This process occurs when ribosomes, which are attached to the rough ER, synthesize proteins that are destined either for the cell membrane or for export from the cell. The synthesized protein is released into the channel of the rough ER, where a process called glycosylation can add sugars to it. It is then transported within a vesicle to the next station, the Golgi apparatus, where further packaging and shipping processes take place.
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which of the items below would describe the genotype of an individual?
A.blue eyes
B.Bb
C.brown fur
Answer:
I believe c
Explanation:
Which structure is a thin, semitransparent connective tissue sheet that separates the external ear from the middle ear?
Answer: The answer would be the tympanic membrane
The thin semitransparent tympanic membrane, or eardrum, which forms the boundary between the outer ear and the middle ear.
What is the thin structure that separates the outer ear from the middle ear?
The tympanic membrane is also called the eardrum. It separates the outer ear from the middle ear. When sound waves reach the tympanic membrane they cause it to vibrate.
What separates the outer ear from the middle ear?
The outer ear is separated from the middle ear by the tympanic membrane (the eardrum). The structure in the cochlea of the inner ear made up of the basilar membrane, the auditory hair cells, and the tectorial membrane.
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in a vegetable garden 45 bean plants have been eaten by deer 5 are untouched what is the frequency of bean plants in the garden that have been eaten?
Answer:
90%
Explanation:
Frequency of bean plants in the garden that have been eaten can be calculated as the total number of bean plants eaten divided by the total number of all bean plants in the garden.
Given that:
Number of bean plants eaten = 45; number of bean plants uneaten = 5
Total number of bean plants in the garden = 45 + 5 = 50
Therefore, frequency of bean plants in the garden that have been eaten = 45/50 = 0.9 = 90%
Frequency of bean plants eaten in the garden by the deer = 90%
Answer:
90%
Explanation:
Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird?
A. A forest with dense vegetation
B. A sandy beach beside an ocean
C. A snowy tundra with little vegetation
D. A swamp with many hawks that eat birds
In eukaryotic cells the timing of the cell cycle is regulated by
Answer: In eukaryotic cells, the timing of the cell cycle is regulated by cyclins
Explanation:
What's a recharge area? A. The part of an aquifer where surface water reaches the water table B. The part of an aquifer that's located between two aquiclude C. The part of an aquifer that's located at a lower elevation D. The part of an aquifer where groundwater meets a lake or stream
Answer:
A. The part of an aquifer where surface water reaches the water table
Explanation:
The aquifers are underground natural reservoirs of water, mostly freshwater, though there are also some with saline water. The aquifer both gets water from outer sources, and it also loses water, be it in a natural way, or because of the human activities. The recharging is the manner in which the aquifer gets its water replenished. The recharging area is the area where the surface water manages to reach the aquifer, thus providing it with fresh, new reserves of water.
The genetic code is essentially the same for all organisms. Based on this information, one can logically assume which of the following statements to be correct? a. DNA was the first genetic material. b. The same codons in different organisms translate into the different amino acids. c. Different organisms have different numbers of different types of amino acids. d. A gene from an organism can theoretically be expressed by any other organism. e. All organisms have experienced convergent evolution.
Answer:
D
Explanation:
The same genetic code that all organisms share indicates that a gene from any organism can theoretically be expressed by any other organism, due to the universality of genetic coding and conservation of codons. This suggests a common origin for all life on earth.
Explanation:The genetic code being the same for all organisms means that, regardless of the organism, the same codons are used to code for the same amino acids. This is due to the conservation of codons. The correct assumption would be: d. A gene from an organism can theoretically be expressed by any other organism. In other words, because of the universality of the genetic code, a gene that encodes a protein in one species could theoretically be transplanted into any other species where it would still produce the same protein. For example, if an mRNA encoding the horse's globin protein was transferred to a tulip cell, the tulip would synthesize horse globin. That there is only one genetic code is compelling evidence that all life on Earth shares a common origin, underscored by the fact that there are approximately 1084 possible combinations of 20 amino acids and 64 triplet codons.
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if an organism displays a trait or does not display a trait,what can we say about that trait?
A.it is polygenic
B.it has mutated
C.it is controlled by one gene
Answer:
THE ANSWER WOULD BE A
Explanation:
Answer:
C. it is controlled by one gene
Explanation:
NOT A.
i had the same question on my acellus so i know it's c
Nucleic acids offer variability because they contain alternate forms of genes called .
Hello, I believe your answer should be alleles.
Alleles are alterenate forms of genes.
How are messages carried throughout the human body from the brain to the nervous system?
A. Magnetic synapses
B. Active transport
C. Chemical channels
D. Electrical signals
Answer:
Electrical signals- D.
The answer would be D-Electric signals
The neurons through out your body send supppper fast electric signals to appropriate locations
Hope this helped!
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One function of the poly-A tail on eukaryotic mRNA sequences is to help the mRNA be transported from the nucleus to the cytoplasm. Prokaryotic mRNA also has a poly-A tail. Choose the best explanation of the prokaryotic poly-A tail.
A. Prokaryotic poly-A tails have the same functions as eukaryotic poly-A tails, because this process is highly conserved throughout different species.
B. Prokaryotic poly-A tails are composed of a different molecular structure compared with eukaryotic poly-A tails.
C. Prokaryotic poly-A tails aren't important, because prokaryotes don't have nuclei.
D. Prokaryotic poly-A tails have other functions, because prokaryotes don't have nuclei.
PLEASE HELP! ASAP! FIFTEEN POINTS!
Describe two types of evidence scientists use to support the theory of evolution. Describe means to tell details about the topic so be sure to include a clear explanation for each one with at least one detail or example. Enter your answer in the space provided. I need this by today at 1:00. Thanks!
Answer:
Anatomy supports the theory of evolution because some species share similar physical features that was present in a common ancestor.
An example of shared anatomy is sharks and dolphins. types of analogous structures, such as dolphins and sharks, do not prove species are related, but rather they support the Theory of Evolution by show how species do build up adaptations in order to fit into their environments
Molecular biology because DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.
in recent research is has been shown that the myoglobin and hemoglobin sequences for dozens of mammals, birds, reptiles, amphibians, fish, worms, and molluscs were related.
Structural similarities is when different animals share the same structural similarities. For example the skeletons of turtles, horses, humans, birds, and bats are very similar, despite their t different ways of life and the diversity of their environments.
Explanation: