Question

The Earth's early (primitive) atmosphere contained no

A) Water vapor
B) Methane
C) Oxygen
D) Ammonia

Answer 1

C) Oxygen

Step-by-step explanation:

As the Earth cooled, a primitive atmosphere was created by the out-gassing of early volcanoes. The early atmosphere contained no oxygen and would have been toxic to human beings, as well as most other life on Earth today.

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