The chemical composition of the atmosphere has remained stable through the history of the earth true or false?

In my opinion the answer will be false that's what I think for the answer it doesn't make that much sence so it's false

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

i think the answer is composed of atoms