A species of bird developed a new beak shape that helped the birds eat different types of food. Which sentence most likely explains why the bird
species changed over time?
A. The new beak shape improved the likelihood that the birds would
survive and reproduce.
B. The new beak shape caused air drag and slowed down the birds
during flight.
C. The new beak shape prevented the birds from defending
themselves from predators.
D. The new beak shape increased the amount of food the birds
needed to eat to survive.