Question

why gases like carbon dioxide nitrogen and oxygen are called the fixed the component of the atmosphere​

Answer 1

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The total amount of CO2 injected in the early Earth atmosphere after the formation of the Moon (that blew off the earliest atmosphere) would be equivalent to about 60 bars of atmospheric pressure. But CO2 has just vanished, because it is soluble in water. It next forms carbonic acid that reacts with rocks as to yields carbonates . They are now stored in sedimentary rocks. The difference with Mars and Venus is that the Earth also accumulated and kept a huge amount of water (about 270 bars) now mostly stored in the oceans.