Answer:
I think is C
Explanation:
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Venus: almost no surface winds, sulfuric acid clouds, runaway greenhouse effect.
Earth: atmosphere composed primarily of nitrogen and ultraviolet-absorbing stratosphere
Mars: extremely low-density atmosphere, global dust storms.
<span>An eon is a geologically around tens of millions of years. A period is a million year included in an eon which is also made up of several eras. Therefore my answer is a period due to it being a subset of an era which is a subset of an eon.</span>