There are four species of Mockingbird that inhabit the Galapagos Islands. Their beaks are different sizes and shapes but DNA evidence shows they likely all descended from a common ancestor species which reached the islands in a single colonization event. Why would scientists theorize that the mockingbirds had changed over time?
O A. The birds avoided humans as well as predators,
OB. The birds adapted to the different elevations of the island.
OC. The birds prefer a mate with an attractive beak.
O D. The birds adapted to the availability of local food sources,