Rover

Biology

13 April, 16:06

During drought years on the Galapagos, small, easily eaten seeds become rare, leaving mostly large, hard-cased seeds that only birds w / large beaks can eat. If a drought persists for several yrs, what should one expect to result from natural selection?

A. larger birds eating less so smaller birds can survive

B. more small-beaked birds dying than large-beaked birds. The offspring produce in subsequent generations have a higher % of birds w / larger beaks

C. small birds mutating their beak genes w / the result that later-generation offspring have larger beaks

D. small birds gaining larger beaks by exercising their mouth parts