Biology, 22.08.2019 08:30 Ayakouhail1

Which mixture of gases is thought to have made up earth's early atmosphere? a. methane, oxygen, hydrogen, water vapor b. carbon dioxide, nitrogen, oxygen, ozone c. hydrogen, water vapor, ammonia, methane, carbon dioxide d. ozone, water vapor, carbon dioxide, ammonia

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Which mixture of gases is thought to have made up earth's early atmosphere? a. methane, oxygen, hyd...