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weqwewe [10]
3 years ago
12

A.Describe role and use of oxygen in air and life of animais​

Biology
2 answers:
yulyashka [42]3 years ago
6 0

Answer:

Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things. We humans, along with many other creatures, need oxygen in the air we breathe to stay alive. Oxygen is generated during photosynthesis by plants and many types of microbes.

Viktor [21]3 years ago
3 0

Answer:

All living organisms except plants need oxygen, as oxygen is what ignites all living things .. Plants take carbon dioxide and produce oxygen gas through the process of photosynthesis.

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Why does an element have a fixed, uniform composition?​
lbvjy [14]

Answer:

Element is a substance that cannot be broken down into simpler substances. Atoms are the smallest particle of an element. An element has a fixed composition because it contains only one type of atom.

7 0
3 years ago
A student would like to determine how heating a liquid changes its volume. The student hypothesizes that the liquid will increas
Lisa [10]

Answer:

a The volume of the liquid should be measured before it is heated.

Explanation:

A student would like to determine how heating a liquid changes its volume. The student hypothesizes that the liquid will increase in volume. The following list shows the steps taken by the student in order to test the hypothesis.

Select the liquid to test.

Place the liquid in a sealed container.

Use a Bunsen burner to heat the liquid by 10°C.

Measure the volume of the liquid.

Record the results.

What is wrong with how the student conducted the investigation?

a The volume of the liquid should be measured before it is heated.

b The hypothesis was not valid because it is impossible for liquids to change in volume.

c The student should have increased the temperature of the liquid by more than 10ºC.

d The length of time it took for the liquid to be heated should be measured.

The answer is A i.e The volume of the liquid should be measured before it is heated. I think this is surely right!!

5 0
2 years ago
Which statement describes the current theory about the relationship between the human population and mass extinction? The human
Flauer [41]
<span>The human population is increasing, so the likelihood of a mass extinction is also increasing.

The human population is increasing, and historically, as human population has increased, species have gone extinct. As human population increases, and also destroy more habitats to pay for higher standards of living, the probability of mass extinction increases. </span>
5 0
3 years ago
Read 2 more answers
List at least 3 reasons why scientists can not adequately catalog every species on Earth.
valentinak56 [21]

Answer:

<h3><u>One of the reasons we can't get an accurate count is that the bulk of the things that have yet to be discovered and described are in the realm of the very small: insects, bacteria and other microbes</u></h3>

Explanation:

I THINK THIS IS HELPFUL

3 0
3 years ago
If Huntington's disease is due to a dominant trait, shouldn't three-fourths of the population have Huntington's while one-fourth
andre [41]
"<span>Appearance of a trait in a population does not solely depend on its dominant or recessive nature" is the correct choice among the choices that are given in the question. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has helped you.</span>
3 0
3 years ago
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