If a sample of DNA has 15% A, how much T, C, and G is present?

According to Chargaffs rule, the total amount of adenine released is equal to the total amount of thymine and the total amount of cytosine is equal to the total amount of guanine, ie, A = T and C = G. Thus, if DNA molecule contains 15% adenine then C and G will constitute 70%, out of which guanine will be 35%.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.