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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

asked
User Sergiu Dumitriu
by
7.5k points

2 Answers

2 votes

Answer:

b

Step-by-step explanation:

answered
User Ndidi
by
8.2k points
0 votes

Answer:

the answer is B. archean

answered
User Gareth Cornish
by
8.3k points
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