BIOLOGY HIGH SCHOOL

Which adaptation is used by polar bears to maintain internal homeostasis in cold temperatures?

Answers

Answer 1
Answer: What polar bears do to keep their temperature at a steady pace in cold temperatures is that they eat enough food to have a steady source and supply/constant amount of fat. Fat acts as an insulating agent and bears have plenty of it. This also explain why a lot of other animals who live in very cold climates have a lot of fat on their bodies. 

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Water makes up a large percentage of the body’s cells. For a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. The movement of water from an area of high water concentration to an area of low water concentration is

How does oxygen enter a cell?A. Active transport
B. Facilitated diffusion
C. Simple diffusion
D. Osmosis

Answers

Answer:

C

Explanation:

What would most likely occur over time if new technologies gave us information that challenged what scientists currently understand about natural selection

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Question options:

A new scientific law would be established and proven by the findings. A new scientific theory would be established and proven by the findings. A current scientific law would be revised based on the new findings. A current scientific theory would be revised based on the new findings.

Answer:

A current scientific theory would be revised based on the new findings.

Explanation:

If new findings came about and challenged the current theory of natural selection so that Darwin's theory didn't look like it was true at all, the initial theory(darwin's theory of natural selection) would not be entirely discarded but revised according to these new findings and then form a sort of backbone to this new theory which would be based on findings of many independent researchers and not just one. Example: how some of Sigmund Freud's theories or Aristotle's may not be entirely valid today but still works as a fundamental for understanding other theories.

Which statement accurately describes the relationship between the brain and addiction?A. Normal activities produce heightened responses once receptors are reduced.   B. A higher amount of addictive chemicals are needed to get the same high when fewer receptors are present.   C. The brain reacts to excessive dopamine levels by increasing the number of dopamine receptors.   D. All drugs act on dopamine synapses in the same way.

Answers

 C. The brain reacts to excessive dopamine levels by increasing the number of dopamine receptors. 

The statement accurately describes the relationship between the brain and addiction. There is a significant link between neurotransmitters and its influence on the activity and the emotion that we feel towards that set of activity. When there is an abnormal or disoriented amount of neuro-chemicals then it would cause some dysfunctional responses on the activity. 

How does a decrease/decline in a top predator impact biodiversity in an ecosystem?(GIVING HIGH AMOUNT OF POINTS FOR AN ANSWER)

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Answer:

The ecosystem will fall out of balance.

Explanation:

The ecosystem will fall out of balance because once you remove the top predator, the plant-eaters will grow in numbers, they will eat all of the vegetation, and will either need to adapt or die. Predators are very important, as is everything in the food chain

Suppose you are in the southern hemisphere during the month of December what would happen to the amount of sunlight as you travel south

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The amount of sunlight would increase because the northern hemisphere is shifted up during winter. The southern hemisphere would be closer to the sun allowing more sunlight during the daytime.

I need to match the letter with the correct descriptionMatch the item with its description.
Matching Questions Matching Answers
human factor which uses a large amount of freshwater A. farming
use of these creates smog and acid rain B. greenhouse effect
serve as nature's "giant sponges" C. deforestation
Giant pandas are endangered mainly because of this. D. loss of predators
White-tail deer are overpopulated due to this. E. human
factor which leads to habitat destruction. global warming, and erosion F. DDT
adjustments created by humans which alter the balance of our ecosystem G. loss of habitat
burning fossil fuels increases this H. human factor
species responsible for greatest amount of environmental change I. fossil fuels
cheap, effective insecticide which is harmful to other species J. wetlands
I need this done Asap

Answers

The answers are as follows 1J, 2I, 3H 4G 5D 6C 7A 8B 9E 10F Wetlands are the factor which uses a large amount of freshwater. The fossil fuels use of these creates smog and acid rain. Human factor serve as serve as nature's "giant sponges", Besides, Giant pandas are endangered mainly because of loss of habitat and because of loss of predators White-tail deer are overpopulated. As for deforestation, it is considered as a factor which leads to habitat destruction, global warming, and erosion. Farming is adjustments created by humans which alter the balance of our ecosystem. The greenhouse effect is dangerous because burning fossil fuels increases this. In other hand, human being are species responsible for greatest amount of environmental change and. Finally, DDT is cheap, effective insecticide which is harmful to other species.
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