Question

how can the bases vary from one organism to another?
amount of bases & sequence
amount of bases & size
sequence & size
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Explanation:

The bases in DNA can vary between organisms in terms of the amount of each base (adenine, thymine, cytosine, guanine) present and also in the sequence in which they are arranged. The size is not a typical way to describe base - variation between organisms.

Answer:

Amount of bases & Sequence