Science, asked by sandysandy4731, 7 months ago

Which describes oxygen content as Earth evolved over time
A. Oxygen levels sharply declined about 400 million years ago.
B. Oxygen levels stay above 15 percent starting 200 million years ago.
C. Oxygen levels raise significantly between 1000 and 700 million years ago.

Answers

Answered by jasmin3067

3

C. oxygen level raise significantly between 1000 and 700 million years ago

Answered by DomoCake

0

Answer:

b. Oxygen levels stay above 15 percent starting 200 million years ago

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