3. The birds shown below live on a single island. (7.L.15.2)
3. These 4 bird species are closely related, and all of them
share a common ancestor with a single species. What
environmental factor is most likely to have caused 4
distinct species to come about?
Name a type of evidence that scientists might use to show
that these birds are related, and evolved from a single
species over 1 million years ago?