2 years ago

HELP ME GUYS PLEASE!

Biology

2 answers:

german2 years ago

8 0

Answer: number 1

Explanation: that is when we could first sustain life because that is when we gained atmosphere and when we could hold carbon and oxogen

olga2289 [7]2 years ago

7 0

Answer:

I think the answer was A. Because before the ozone layer oxygen was not as much for life on earth to evolve so once the ozone layer started to form up it kept organisms and earth surface safe from direct uv lights so life started evolving.

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