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 solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

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