Question

questions 1 through 3 refer to the following.
the graphs above show the population size and distribution of beak sizes in a finch
population on the island of daphne major in the galapagos in 1976 and 1978. smaller-
which of the following statements best explains the changes in the size and composition of
the population of finches after the drought?
a the total number of finches in the population increased, and the
smaller-beaked finches were more successful in the drier
environment.
b the total number of finches in the population increased, and the
larger-beaked finches were more successful in the drier
environment.
c the total number of finches in the population decreased, and the
smaller-beaked finches were more successful in the drier
environment.
d the total number of finches in the population decreased, and the
larger-beaked finches were more successful in the drier
environment.

Explanation:

• In 1976, the population of finches was larger (as seen in the graph with a higher number of finches on the y - axis).
• After the drought (1978), the population decreased (fewer finches in 1978 graph).
• Larger - beaked finches were more successful in the drier environment (as the distribution shifted towards larger beak depths in 1978).

Answer:

D. The total number of finches in the population decreased, and the larger - beaked finches were more successful in the drier environment.