In General, Each Species of Fruit Fly in the Hawaiian

Multiple Choice

In general, each species of fruit fly in the Hawaiian archipelago is restricted to a single island. One hypothesis to explain this pattern is that new species formed after a small number of flies colonized each new island. This mechanism of speciation is called

A) artificial selection.
B) genetic equilibrium.
C) sexual selection.
D) the founder effect.
E) assortative mating.