Biology, 11.10.2019 02:30 peno211

Before there was life on earth, which gas was absent from the ancient atmosphere?

a. ammonia
b. methane
c .nitrogen
d. oxygen

Answers: 3

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More questions: Biology Another questions

Before there was life on earth, which gas was absent from the ancient atmosphere? a. ammonia b. methane c .nitrogen d. oxygen

Answers

Another question on Biology

Before there was life on earth, which gas was absent from the ancient atmosphere?

a. ammonia
b. methane
c .nitrogen
d. oxygen