Question

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

Answer 1

Answer:

b. birds

Explanation:

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

Answer 2

Answer:

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

Explanation:

I hope that answered your question in time