Two Populations of Plants Found in the Same Meadow Look

Multiple Choice

Two populations of plants found in the same meadow look identical but are fertilized by different pollinators-one by a night-flying hummingbird moth, the other by honeybees that fly by day. This is an example of

A) ecological isolation.
B) mechanical incompatibility.
C) geographic isolation.
D) behavioral isolation.
E) temporal isolation.