Question

which type of natural selection did the grants observe when studying the beak size of galápagos finches?
a disruptive selection
b directional selection
c stabilizing selection

Explanation:

The Grants studied Galápagos finches' beak size. During droughts, finches with larger beaks (better at cracking tough seeds) survived and reproduced more, shifting the population's beak size distribution in one direction. This is directional selection (favors one extreme phenotype). Disruptive selection favors two extremes, and stabilizing favors the average—neither matches the Grants' observation.

Answer:

b. directional selection