Q: Escaping poor weather and food supply changes what?\nOptions:\n- (A) population age\n- (B) the environment\n- (C) population education\n- (D) general preferences\n- (E) important habitats\n- (F) population size\n- (G) movement\n- (H) an organism's body
Let's think step by step below.

User
Migration is a type of movement that changes population size. Birds migrate to escape poor weather and food supply. Escaping poor weather and food supply changes population size.
Thus, the answer is (F).
Assistant