Question

Which mixture of gases is thought to have made up Earth's early atmosphere? A. methane, oxygen, hydrogen, water vapor B. carbon dioxide, nitrogen, oxygen, ozone C. hydrogen, water vapor, ammonia, methane, carbon dioxide D. ozone, water vapor, carbon dioxide, ammonia

Answer 1

The answer is D. ozone, water vapor, carbon dioxide, ammonia.

Answer 2

We really don't know what early earth's atmosphere contained. We can only speculate. Likely, it contained methane at some point, along with other noxious gases from erupting volcanoes.