During drought years on the Galapagos Islands, small, easily eaten seeds become rare leaving only large, hard-cased seeds that only birds with large beaks can eat. If a drought persists for several years, then what should one expect as a result of natural selection?
a. Small birds gaining larger beaks through trying to eat larger seeds.
b. Small birds undergoing mutations to produce larger beaks.
c. A higher death rate of birds with small beaks than that of birds with larger beaks.
d. Larger birds eating less so that smaller birds can survive.
e. Smaller birds storing up energy by eating large amounts of small seeds when rainy seasons come.