After Earth formed, its surface cooled and solidified. Volcanoes began spewing gas into the atmosphere. Which two gases made up most of Earth's atmosphere during this period?

Ammonia and Carbon Dioxide

Explanation:

It is Ammonia and Carbon dioxide, stage 2 of the atmosphere. Little or no traces of oxygen or Nitrogen.

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the sphincter muscles at the end of the digestive tract is the anus.

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