What do the changing percentages of various gases in the atmosphere indicate about mechanisms that control the composition of the atmosphere?
A) The changes indicate that the composition of gases is totally controlled by the amount and type of gases given off during volcanic eruptions.
B) The changes indicate that the composition of gases is totally controlled by the composition of comets and meteors that strike Earth.
C) The changes indicate that the composition of gases is to a significant extent controlled by biological processes occurring on Earth.
D) The changes indicate that the composition of gases is exclusively controlled by chemical reactions between sunlight and the gases in the atmosphere.
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