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What was the major contributor of oxygen to earth's early atmosphere ? A) photosynthesis B) Organic respiration C) ozone decomposition D. Decomposition of ocean water Explain your answer in your own words
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What was the major contributor of oxygen to earth's early atmosphere ?

A) photosynthesis

B) Organic respiration

C) ozone decomposition

D. Decomposition of ocean water

Explain your answer in your own words

User Awy
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2 Answers

3 votes
The answer is A) photosynthesis
User Bastien Beurier
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3 votes
I this the answer is B
User Jausen Brett
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