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Genetics: the interaction of an organisms genes with the environment…

- - - - base pairs (they are compounds)
        
        cytosine C4H5N3O: Cytosine is one of the four main bases found in DNA and RNA, along with adenine, guanine, and thymine. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached. The nucleoside of cytosine is cytidine
        
        thymine C5H6N2O2: Thymine is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters The others are adenine, guanine, and cytosine. Thymine is also known as 5-methyluracil, a pyrimidine nucleobase.
        
        adenine C5H5N5: Adenine is a nucleobase. Its derivatives have a variety of roles in biochemistry including cellular respiration, in the form of both the energy-rich adenosine triphosphate and the cofactors nicotinamide
        
        guanine C5H5N5O: Guanine is one of the four main nucleobases found in the nucleic acids DNA and RNA, the others being adenine, cytosine, and thymine. In DNA, guanine is paired with cytosine. The guanine nucleoside is called guanosine
      - the basic physical unit of heredity ;a liner sequence of nucleotides along a segment of a NDA that previeds the coded instructions for synthesis or RNA which the translated into protein leads to the expression of hereditary characher