Hello There!
Diffusion is the movement of molecules in a liquid from a region of high concentration to a region of low concentration.
Some examples.
Smells spread by diffusion
Cell using oxygen in reparation
Photosynthesis oxygen diffuses out of cell
Perfume is sprayed in one part of a room, yet soon it diffuses so that you can smell it everywhere. A drop of food coloring diffuses throughout the water in a glass so that, eventually, the entire glass will be colored
areas with hypoxia are known as __ zones
The answer is : dead zones.
Answer:
Dead zone.
Explanation:
Hypoxia may be defined as the condition of the reduced level of oxygen in the environment. The hypoxia condition of the sea may occur due to naturally or artificially.
The hypoxia area are commonly known as dead zones. This area leads to the death of most of the marine organism due to the deficiency of the oxygen. Excess nutrients flow in the river causes the more chances of the development of the dead zones.
Thus, the answer is dead zones.
Which is a major factor affecting population growth rate? (Site 1)
Final answer:
Birth rates versus death rates, immigration, and emigration are primary factors affecting population growth rate. Local site-level factors, including resource availability and demographic processes, also significantly impact population dynamics and can influence larger scale trends.
Explanation:
A major factor affecting population growth rate is the balance between birth rates and death rates, alongside immigration and emigration. If the birth rate exceeds the death rate, the population will grow, whereas the population will decrease if the reverse is true. When birth and death rates are equal, the population size remains stable. Additional factors influencing population size include resource availability, environmental conditions, such as droughts, and biotic factors like predation, parasitism, and competition.
The labor market and economic factors such as GDP can also reflect changes in population size. Populations are affected significantly by factors at the site level, encompassing local resources and demographic processes, which can in turn influence larger scale population dynamics.
Some steps in cell division are shown below:
1. Chromosomes condense and pair up
2. Segments of DNA of sister chromatids twist and cross
3. Exchange of DNA occurs between chromosomes
4. Four daughter cells are created that are haploid
Which of the following steps is least likely to occur during meiosis 1?
Step 1
Step 2
Step 3
Step 4
Answer:
Step 4
Explanation:
Bcoz only 2 haploid cells are formed at the end of meiosis 1st...at the end of meiosis 2nd.. 4 haploid cells formed
Answer:
The correct answer would be step 4.
Meiosis I is the reduction division which results in the formation of two haploid daughter cells from a single parent cell.
It includes prophase I, metaphase I, anaphase I, and telophase I.
During prophase I, first DNA gets condense to form chromosomes. Each chromosome consists of two sister chromatids. Then the event of crossing-over (exchange of genetic material) takes place.
By the end of meiosis I, the homologous chromosomes are separated into two daughter cells.
Meiosis II results in the formation of four haploid daughter cells.
which organelle conatins chemicals that break down substances in the cell?
a. lysosomems
b. vesicles
c. Mitochondria
d. nucleus
please help for tommoroq
Answer:
Lysosomems that break down substances in the cell. - a.
Need help on checking my answers! The ones circled in yellow are the ones that I believe the answers are. Please and thank you
Answer:
b) development
Explanation:
A tadpole turns into a frog over it's lifetime. this is called development
A gardener notices that some of her green plants are experiencing the
following changes during the middle of summer:
• Brown or yellow discoloration in the leaves
• Reduced leaf size
How will these changes most likely affect the plants?
A. The plants will make fewer nutrients because of chlorophyll loss.
B. The plants will increase the number of chloroplasts in their cells.
C. The plants will grow more roots in search of water.
D. The plants will decrease their reliance on the sun's energy.
Answer:
B. The plants will make fewer nutrients because of chlorophyll loss.
Explanation:
The surface of the leaf is lined with chloroplasts.
Since the leaf sizes have been reduced, chloroplasts have followed. Thus, there are less chlorophyll pigments, indicating less chances of photosynthesis, meaning fewer nutrients made.
Answer:
The correct answer is option A- the plants will make fewer nutrients because of chlorophyll loss.
Explanation:
Summer is experienced with high temperature and high intensity of light which shows effects on the plant.
Exposure to high temperature and high light intensity above threshold cause several physiological and morphological changes in the plants like affect the chlorophyll. Chlorophyll gets degraded by a process called " chlorosis" due to which brown and yellow patches start appearing on the leaves.
The chlorophyll loss leads to less production of glucose molecule as the sunlight is not captured by the chlorophyll, a pre-requisite condition of the photosynthesis.
Thus, option- A is the correct option.
When the solution concentration on the outside of a cell is greater than the solution concentrate on the inside of the cell, what type of solution is the cell within?
Answer:
Hypotonic solution
Explanation:
The solution with lower solute concentration is referred to as hypotonic solution while the other with higher solute concentration is called as hypertonic solution.
Since the solution concentration on inside of the cell is lower than that of solution present on the outside the cell; the solution inside the cell is hypotonic.
What is point source pollution of an aquatic ecosystem
Answer: Point source pollution is water pollution that comes from a direct single source and can easily be traced. Some examples of point source pollution can be oil spills, sewage drainage pipes, unlined landfills
Point source pollution occurs when pollutants enter an aquatic ecosystem from a single identifiable location, such as sewage discharges, leading to problems like eutrophication and harm to aquatic life.
Explanation:Point source pollution of an aquatic ecosystem refers to contaminants entering the environment from a single, identifiable source. Examples include discharges from wastewater treatment plants, factories, and combined sewers. During heavy rain, combined sewer systems may overflow, leading to direct spilling of untreated sewage into water bodies.
Eutrophication is another consequence of point source pollution, wherein excessive nutrients, such as nitrates and phosphates from waste, promote overgrowth of algae and bacteria. This leads to oxygen depletion in the water, adversely affecting fish and other aquatic life. Ocean acidification is a separate issue where excess CO2 in the atmosphere causes oceans to become acidic, which can harm corals and shellfish. In addition to chemicals, physical debris can also be a point source of pollution, posing dangers to aquatic wildlife.
Learn more about Point source pollution here:https://brainly.com/question/29998171
#SPJ2
In plants, tubes transport nutrients throughout the plant.
In humans, which parts carry out that function?
A.
small intestines
B.
alveoli
C.
nerves
D.
blood vessels
Answer:
D. blood vessels
Explanation:
Blood vessels the answer
An unknown mineral scratches apatite and is scratched by corundum. What can you conclude about this mineral’s hardness?
If we guide ourselves with the Moh´s scale:
Material scratches apatite → material is harder than 5.
Material is scratched by corundum → material is softer than 9.
Conclusion:
The hardness of the unknown material stands between 5 and 9.
Note:
Both apatite and corundum are defining materials (reference materials in the Moh´s scale). So, you can also give an answer using defining materials:
"It can either be an orthoclase feldspar, a quartz or a topaz".
Hope it helped,
BiologiaMagister
This answer is dedicated to JaySL
According to the question, you can conclude that the hardness of the unknown mineral significantly stands between 5 and 9 on the Moh's Scale.
What is the hardness of apatite and corundum?On Moh's scale, the hardness of apatite is found to be 5, while the hardness of corundum is found to be 9. Apatite is scratched with a knife with difficulty, while corundum is not able to scratch by a knife, because it has a high level of hardness.
It is found that if any mineral scratches apatite, this material will surely have a hardness of more than 5. While if any mineral scratches corundum, this material will surely have a softness than 9.
Corundum is an aluminum oxide that commonly forms hexagonal barrel-shaped prisms that taper at both ends or as thin tabular hexagonal plates. It has a hardness of 9 on the Mohs scale,
Therefore, you can conclude that the hardness of the unknown mineral significantly stands between 5 and 9 on the Moh's Scale.
To learn more about Hardness of mineral, refer to the link:
https://brainly.com/question/18152739
#SPJ6
Which type of bacteria is shown in the image?
A. bacillus
B. coccus
C. spirillum
D. cholera
i need help now
Answer:
B. coccus
Explanation:
I took the test on usatestprep
and put the image next time
Final answer:
The term 'vibrio' is used to refer to a prokaryotic cell that is comma-shaped, distinguishing it from other bacterial shapes such as coccus (spherically shaped) and bacillus (rod-shaped).
Explanation:
In the context of bacterial shapes, when referring to a prokaryotic cell that is comma-shaped, the term that is used is vibrio. Bacteria are categorized into different shapes primarily based on their cellular morphology. For instance, coccus (pl. cocci) is a term for spherical-shaped cells, while bacillus (pl. bacilli) is used for rod-shaped cells. When bacteria present a curved rod shape, it indicates a vibrio, which are rods with a single curve, as opposed to spirillum or spirochetes that have multiple curves or a spiral shape. Therefore, the type of bacteria that is comma-shaped is called vibrio.
which kingdom does this organism belong to
The five-kingdom system of classification for living organisms, including the prokaryotic Monera and the eukaryotic Protista, Fungi, Plantae and Animalia is complicated by the discovery of archaebacteria.
Answer Protista
Explanation: srry if am wrong
igneous rocks are classified based upon their:
Answer:
Composition and texture. Hope this helps.
Explanation:
Answer:
texture and mineralogy
Explanation:
which of the following choices contains a nucleus?
a. bacteria
b. eukaryotes
c. prokaryotes
Answer:
b. eukaryotes
Explanation:
Eukaryotic cells have a true nucleus, which means the cell’s DNA is surrounded by a membrane. Therefore, the nucleus houses the cell’s DNA and directs the synthesis of proteins and ribosomes, the cellular organelles responsible for protein synthesis.
Eukaryotes are the group of organisms that contain a nucleus in their cells. Unlike prokaryotes (which include bacteria), eukaryotic cells are defined by the presence of a nucleus and other membrane-bound organelles.
Explanation:The organism that contains a nucleus among the given options is the eukaryotes. To explain further, living organisms can be divided into two broad categories: eukaryotes and prokaryotes. Eukaryotes are organisms whose cells contain a nucleus and other organelles enclosed within membranes. Examples of eukaryotes are fungi, plants, and animals. Meanwhile, bacteria and prokaryotes do not have a nucleus. Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures, including a nucleus.
Learn more about Cellular Structure here:https://brainly.com/question/31661300
#SPJ6
What problems would you expect to observe in an ecosystem without producers?
hi! producers are the main source of energy for consumers because they turn sunlight into chemical energy. without producers, no ecosystem would be able to survive because consumers would no longer have energy needed to live. hope this helps!
Which of the following is an example of microevolution?
Answer:
A population of birds slowly changes feather color from red to blue.
Explanation:
Hope this helps!
cid rain throughout the northeast United States has lowered the pH of many ponds and lakes. The lowered pH will eventually result in the death of many aquatic animals. The table shows the pH tolerance levels for water that supports a variety of nine animal species.
What is the mathematical range of the minimum pH levels that supports life for the nine species?
A) 2.5
B) 4.5
C) 5.5
D) 7
Answer:
The answer is A (2.5)
Explanation:
I looked the question up for you but since there is not a chart I can not give you an accurate explanation. Good luck !
Answer:
a
Explanation:
What is intelligence
Answer:
The cognitive abilities of an individual to learn from experience, to reason well, and to cope effectively with the demands of daily living
Explanation:
Intelligence is something that can actually be measured, even though it is not a physical, but a psychological trait. The humans had wanted to be able to measure their intelligence for quite some time, but that only became possible with the development of the modern psychology and the test specially created for this purpose. The intelligence represents the cognitive abilities of an individual to learn from experiences, how well can it reason, as well as to cope effectively with the demands of the daily living. To put it more simple, it is the ability of an individual to acquire and apply skills and knowledge in its life.
For a virus, what advantages and disadvantages does the lytic lifecycle have compared with the lysogenic lifecycle?
A. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell. B. The lytic lifecycle allows viruses to reproduce when the host cell reproduces, spreading to its daughter cells, but also gives the host cell more time to detect and fight the virus. C. The lytic lifecycle allows a virus to wait until conditions are optimal before reproducing but also gives the host cell more time to detect and fight the virus. D. The lytic lifecycle ensures that the virus won't be detected by the host cell but also kills the host and forces the virus to find a new host cell.
Answer:
A. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell.
Explanation:
The lytic lifestyle of the viruses (e.g. bacteriophage) can be described through the next steps:
attachment and injection into the host cell (e.g.bacterial cell) synthesis of the early virus proteins which break down host's DNA virus uses host's machinery (for the replication, transcription and translation) to produce the rest of its proteins and to form new virus particles. host cell burst and many new virus particles are released.During the lysogenic cycle, virus does not kill the host. It integrated its DNA into host's genome and stays dormant until conditions are optimal for reproduction.
Answer:
A. The lytic lifecycle allows viruses to reproduce more quickly but also kills the host and forces the virus to find a new host cell.
Explanation:
bc it says in the textbook
what type of fossils are a cast or mold in a rock?
A. cast fossils
B. mold fossils
C. impression fossils
D. impact fossils
C. Impression fossils.
It can be both a cast and/or mold fossil. It leaves an impression on the fossil. Hope I helped! :3
Answer: C
Impression fossils are when the bone's shape and texture is imprint on a rock. So, the answer is impression rocks. They are usually sedimentary type rocks.
what is an autotroph and what is a heterotroph
Autographs are organisms that make their own food/energy. The only example I can think of (and the only one I think exists) is plants. They make glucose from the sun and other stuff
Heterotrophs are organisms that needs to get its energy from other sources. You and me are heterotrophs (well unless you are a plant lol). We have to eat food to get energy to survive.
Hope this helped!!!
Answer:
An autotroph is an organism that is able to form nutritional organic substances from simple inorganic substances
An heterotroph is an organism deriving its nutritional requirements from complex organic substances.
Explanation:
need help asap
11. Crossing over occurs
A)
in the
developing
zygote
in gametes
prior to
fertilization
during
prophase II
prior to
random
alignment in
metaphase
Answer:
It occur prior to randim assignment in metaphase.
What could be achieved by DNA profiling using gel electrophoresis?
Answer:
Gel electrophoresis is a technique used to separate DNA fragments according to their size. DNA samples are loaded into wells (indentations) at one end of a gel, and an electric current is applied to pull them through the gel. DNA fragments are negatively charged, so they move towards the positive electrode.
Why is it important for an organism to maintain homeostasis
Answer:
If not they could die.
Explanation:
Some organisms cannot survive in harsh weather conditions so they must balance homeostasis to survive.
Maintaining homeostasis is essential for an organism's survival. It serves to keep internal conditions optimal and stable, regardless of external changes. Disruption of homeostasis can lead to disease.
Explanation:It's crucial for an organism to maintain homeostasis to ensure optimal and stable conditions within its internal environment, regardless of external changes. Homeostasis involves multiple processes that keep conditions within certain boundaries, or set points, to allow the organism to function effectively. For instance, humans maintain a body temperature of approximately 37 degrees Celsius, despite the influence of external temperatures. Similar processes control glucose levels, water balance, and pH balance in the blood. Failure to maintain homeostasis can lead to disease or, in severe cases, death.
Learn more about Homeostasis here:https://brainly.com/question/31789146
#SPJ6
What cycle do the light-independent reactions use to turn carbon dioxide into glucose?
A. Calvin cycle
B. Krebs cycle
C. Electron transport cycle
D. Glycolytic cycle
The answer is a the Calvin cycle
Calvin cycle is used by light-independent reactions to turn carbon dioxide into glucose. Therefore, option A is correct.
The Calvin cycle is also known as the Calvin-Benson cycle or the dark reaction. It is a series of biochemical reactions that occur in the stroma of chloroplasts during photosynthesis.
The primary function of the Calvin cycle is to convert carbon dioxide (CO2) from the atmosphere into glucose and other organic compounds. It is the second stage of photosynthesis, following the light-dependent reactions that occur in the thylakoid membranes.
Learn more about Calvin cycle, here:
https://brainly.com/question/33360156
#SPJ4
Determine the stability of each ecosystem
Ecosystem stability on the concepts of equilibrium, resistance, and resilience. These factors, along with biodiversity and disruptions to food chains and food webs, can influence whether an ecosystem remains stable or undergoes destructive or irreversible changes.
Explanation:The stability of an ecosystem can be determined using factors such as its equilibrium, resistance, and resilience. Equilibrium is the steady state of an ecosystem where all organisms are in balance with their environment and with each other. Resistance is the ability of an ecosystem to remain at equilibrium in spite of disturbances, and resilience is the speed at which an ecosystem recovers equilibrium after being disturbed.
When considering human impact, ecosystem resistance and resilience become especially important. Changes in these parameters can lead to changes in ecosystem structure and cause the ecosystem to lose its resilience entirely. This, in turn, can result in the complete destruction or irreversible altering of the ecosystem. Other factors that can affect ecosystem stability include biodiversity and disturbances whether they are internal or external.
Food Chains and Food Webs
Food chains and food webs model the flow of energy and materials between organisms within an ecosystem. Changes in the structure or dynamics of these food chains and webs can also impact the stability of the ecosystem.
Learn more about Ecosystem Stability here:https://brainly.com/question/31806404
#SPJ12
The stability of an ecosystem is determined by its resistance (ability to maintain equilibrium despite disturbances) and resilience (the speed of recovery after disturbances). Ecosystem dynamics study these changes. Biodiversity, food chains, and food webs are key factors in influencing an ecosystem's stability.
Explanation:The stability of an ecosystem is determined by its equilibrium, which is a dynamic state in which changes in species numbers and occurrences are balanced, thus maintaining a certain level of biodiversity. This balance, however, can be disturbed by both external and internal factors. The ecosystem's resistance, its ability to remain at equilibrium despite disturbances, and its resilience, the rate at which it recovers equilibrium after being disturbed, are especially important in measuring changes in ecosystems.
Major disturbances or alterations in the ecosystem could lead to a situation where it loses its resilience entirely, leading to either complete destruction or irreversible altering of the ecosystem. The study of these changes in ecosystem structure caused by environmental changes (disturbances) or by internal forces is called ecosystem dynamics.
Furthermore, the diversity of species within an ecosystem also influences its stability. The food chains and food webs are a part of the ecosystem that showcases the interaction between species and the transfer of energy from one species to another. This further affects the stability of an ecosystem.
Learn more about Ecosystem Stability here:https://brainly.com/question/31806404
#SPJ12
18. RNAi is a technique that silences genes by targeting them and degrading their mRNA. How can this technique be used in scientific laboratories?
A. RNAi is observed in nature, but it can't be used in laboratories.
B. RNAi allows scientists to turn off one gene specifically to study its effect.
C. RNAi has been used in laboratories to make bacteria more susceptible to antibiotics, but has limited application in eukaryotic cells.
D. RNAi is a powerful tool for degrading mRNA, but because it doesn't degrade other types of RNA, its use is limited.
Answer:
B
Explanation:
RNAi is a cellular mechanism for post-transcriptional gene silencing. After transcription of a gene into mRNA, small interfering RNA (siRNA) and microRNA (miRNA) can target the mRNA to form dsRNA. This mRNA then becomes a target of ribonucleases such as the Dicer that break it apart. These mRNA, therefore, do not reach the cytoplasm for translation by ribosomes. This mechanism is hence harnessed and manipulated by scientists to study genes by silencing them.
The correct option is B. RNAi allows scientists to turn off one gene specifically to study its effect.
How can this technique be used in scientific laboratories?RNA interference (RNAi) is indeed a powerful technique used in scientific laboratories to silence or inhibit the expression of specific genes. It involves the introduction of small interfering RNA (siRNA) or short hairpin RNA (shRNA) molecules that are complementary to the target gene's mRNA. These small RNA molecules bind to the mRNA, triggering its degradation or blocking its translation into protein.
By using RNAi, scientists can selectively target and silence the expression of a particular gene of interest. This enables them to study the function of that gene and understand its role in biological processes. By observing the effects of gene silencing, researchers can gain insights into gene function, identify potential therapeutic targets, and investigate disease mechanisms.
So the correct option is b.
Learn more about genes at:
https://brainly.com/question/1480756
#SPJ6
what is the 6 characteristics of animals
Animals are multicellular.
Animals are heterotrophic, obtaining their energy by consuming energy-releasing food substances.
Animals typically reproduce sexually.
Animals are made up of cells that do not have cell walls.
Animals are capable of motion in some stage of their lives.
Animals are able to respond quickly to external stimuli as a result of nerve cells, muscle or contractile tissue, or both.
Plz mark as BRAINLIEST!!!!
Animals are multicellular organisms that exhibits certain characteristics. The organisms that belong to the kingdom Animalia and have eukaryotic multicellular cells. They have DNA as their genome. As they lack chlorophyll, these are included under heterotrophic organisms.
What are heterotrophic organisms?The organisms that cannot make their own food and are dependent on plants for the same directly or indirectly.
The animals have the following characteristics:
All animals require nutrition.They perform respiration.They exhibit movement.They have certain growth.They exhibit reproduction that involves the fusion of gametes.Animals are sensitive to the stimulus.Thus, these are the 6 characteristics of animals.
For more details regarding heterotrophic organisms, visit:
https://brainly.com/question/4933024
#SPJ2
1. Identify each structure below and describe its function(25 points)!!!
Answer:
A. Plasma membrane
B. Cell wall (present only in plants)
C. Cytoplasm
D. Vacoule (occuoy 80 to 90 % space in plant cell)
E. Nucleus
F. Chloroplast (in which photosynthetic occurs.. So found only in plants)
G. Centrioles (help in cell division, present only in animals)
H. Mitochindria
Which of the following adaptions will help a plant survive in the desert?
Stem that stores water
Shallow root system
Large surface area
Flat broad leaves
Answer:
Stem that stores water
Explanation: