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(Help Quick!!) Which eon did oxygen first appear in the atmosphere A. Hadean B. Archean C. Proterozoic D. Phanerozoic
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(Help Quick!!) Which eon did oxygen first appear in the atmosphere

A. Hadean

B. Archean

C. Proterozoic

D. Phanerozoic

User Sergiu Dumitriu
by
4.3k points

2 Answers

2 votes

Answer:

b

Step-by-step explanation:

User Ndidi
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5.0k points
0 votes

Answer:

the answer is B. archean

User Gareth Cornish
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5.2k points
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