Describe how a single pair of seed eating birds could have arrived on an island and evolved into insect eating birds.

These birds could have evolved into insect eating birds by breeding with different kinds of birds, getting used to eating insects after not having bird seed or they have been eating insects just not as much as they should.

DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are. Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.