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KATRIN_1 [288]
3 years ago
8

Which describes oxygen content as Earth evolved over time? Oxygen levels sharply declined about 400 million years ago. Oxygen le

vels stay above 15 percent starting 200 million years ago Oxygen levels remain below 5 percent starting 1000 million years ago. Oxygen levels raise significantly between 1000 and 700 million years ago.
Biology
2 answers:
lora16 [44]3 years ago
5 0

Answer:

b

Explanation:

tankabanditka [31]3 years ago
4 0

the correct answer is b. i just took the quiz

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As an embryo <u>develops</u>, identical cells give rise to specialized cells that <u>perform </u>different functions.

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As an embryo develops, the cells divide, giving new ones. As the cells grow and continue to reproduce themselves, they differentiate, becoming specialized cells. These cells will be located in a particular part of the embryo and will perform a specific function. The shape, size, and organelles vary according to their role.

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Question 5 (12 points)
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