BIOLOGY MIDDLE SCHOOL

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.Which statements explain how this change occurred and how it affected life on earth?

Choose all answers that are correct.



A.


Adding oxygen to earth's atmosphere allowed for the development of prokaryotic organisms, which need oxygen to carry out many of their life processes.


B.


Adding oxygen to earth's atmosphere allowed for the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.


C.


Oxygen is needed to carry out photosynthesis. When cyanobacteria evolved, they began to carry out photosynthesis.


D.


Oxygen is a product of photosynthesis. When cyanobacteria evolved, they began to carry out photosynthesis.

Answers

Answer 1
Answer: b and a are the correct answers

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And natural gas and propane also pollute

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Answer:

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Answers

Answer:

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In which level of the atmosphere is ozone concentrated? A)mesosphere
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Answers

The stratosphere is the second layer of the atmosphere, and it is located between the troposphere and the mesosphere. The stratosphere is where the ozone layer is located. Hence option C is correct.

The ozone layer is a region of the stratosphere that contains a high concentration of ozone gas. Ozone is a molecule that is made up of three oxygen atoms. The ozone layer is important because it absorbs harmful ultraviolet radiation from the sun.

The troposphere is the lowest layer of the atmosphere, and it is where most of Earth's weather occurs. The mesosphere is the third layer of the atmosphere, and it is located above the stratosphere. The thermosphere is the fourth layer of the atmosphere, and it is located above the mesosphere.

To know more about the stratosphere:

brainly.com/question/20888230

#SPJ6

Answer:

First of all i love your profile pic. Answer its he Ozone is concentrated in Stratosphere. About 90% of the stratosphere is concentrated with ozone. Remaining ozone in the lower region is Troposphere.

Explanation:

The answer is C.

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Answers

A.

have a great day M8
a. neutralize it, then pour it down the drain.
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