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

(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
7.5k points

2 Answers

2 votes

Answer:

b

Step-by-step explanation:

User Ndidi
by
8.2k points
0 votes

Answer:

the answer is B. archean

User Gareth Cornish
by
8.3k points
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