Darwin's theory of argues that evolution favors those organisms that are best adapted to their environment.

Darwin's theory of natural selection argues that evolution favors those organisms that are best adapted to their environment. The law states that organisms with heritable traits better suited to the environment will survive while the inferior species will be eliminated.

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

thinking it would be d not too sure but i think it's right