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(HELP QUICK!!) Earth's atmosphere was primarily composed of _______ until the Proterozoic era A. Oxygen B. Nitrogen C. Methane D. Carbon Dioxide
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(HELP QUICK!!) Earth's atmosphere was primarily composed of _______ until the Proterozoic era

A. Oxygen

B. Nitrogen

C. Methane

D. Carbon Dioxide

User Deandra
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2 Answers

6 votes

Answer:

C. Methane is the answer

User Robou
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2 votes

Answer:

methane

Step-by-step explanation:

User Jeroen Van Malderen
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