Two closely related forms of the fruit fly Drosophila mate at different times of day. One type
mates only in the morning, while the other mates only in the afternoon. Which statement most
likely describes the two forms of Drosophila?
A. They share the same gene pool.
B. They belong to the same species.
C. They make up two separate species.
D. They are part of populations in genetic equilibrium.