A population of ground finches has a range of beak sizes. The finches eat
seeds, and larger beaks are better able to crack open the harder seeds.
Smaller beaks are helpful for eating smaller, softer seeds. The graphs show
how the distribution of beak sizes changed over one generation during a
drought.
Number
of birds
-
Population
after selection
-Original
population
Smallest
beak size
வ
Medium
beak size
Largest
beak size
Phenotype: beak size
Based on the graphs, how did the finches adapt to the drought?
A. The most common beak size became larger.
B. The number of birds in the population increased.
C. The range of possible beak sizes increased.
OD. The medium beak size became more common.