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Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain a. sunlight. c. gases. b. birds. d. oxygen. Please select the best answer from the choices provided A B C D

2 Answers

6 votes

Answer:

The correct answer for this is actually O2 or Oxygen :)

Step-by-step explanation:

I hope that answered your question in time

User Mehdi Brillaud
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7.9k points
5 votes

Answer:

b. birds

Step-by-step explanation:

cause i think, birds where not evolved during that period of time..

User Eluvatar
by
8.5k points

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