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PLEASE HELP I feel like the answer is number 4 but im not sure. What was the key factor in creating the Earth's early atmosphere? respiration of single-celled organisms photosynthesis of land plants violent
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PLEASE HELP I feel like the answer is number 4 but im not sure.

What was the key factor in creating the Earth's early atmosphere?



respiration of single-celled organisms


photosynthesis of land plants


violent storms


outgassing by volcanoes

User Igor Liferenko
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1 Answer

5 votes
I think it is also 4
User Urbanleg
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