What did chargaff discover while studying bases in the dna of organisms? the bases in the dna of each organism were unique. the ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine. the overall percentages of bases were different from one organism to the next. there were equal amounts of all four bases in every organism, or 25 percent of each base.

Some species of hummingbirds have different shapes of beaks that evolved to allow them to drink from certain flowers. the flower species have evolved to produce nectar that is tasty for the hummingbirds. this example is a type of . cuckoos lay eggs in the nests of other birds. the cuckoo lays eggs identical to the eggs of the host species, so the other bird takes care of it. this is an example of .