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Question

Primitive earth's atmosphere did not contain ___.

A
ammonia
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B
nitrogen
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C
oxygen
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D
hydrogen
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Solution

The correct option is C oxygen
According to the theory of chemical evolution, the primitive earth's atmosphere was very different from how it is today. The atmosphere did not have oxygen, life arose from a series of chemical reactions. Solar radiation, UV rays and lightning were proposed to be the chief sources of energy.

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