Dr. Cho wants to know if differences in the growth rate of fish are based on genetics or the environment. He buys two fish. Fish 1 is fed every day, while fish 2 is fed every other day. At the end of a month, fish 1 is nearly 15 percent larger than fish 2

A) Environmental changes can account for all the differences in growth rate.
B) Genetic influences must account for a majority of the differences in growth rate.
C) Environmental conditions were more favorable for fish 2.
D) Differences in growth rate cannot be determined by this simple experiment.

Answer: A