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