Which of these statements are supported by the data? Select all that apply.




a. The amounts of A, T, G, and C in
DNA is constant across species.
b. The amounts of A, T, G, and C in
DNA varies from species to species.
c. In any one species, the amount of
adenine closely approximates that of
thymine.
d. In any one species, the amount of
guanine closely approximates that of
cytosine.