Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents. These offspring will breed with each other or with birds from either parent population, and all offspring of these pairings appear intermediate to various degrees. What keeps the two populations separate?
A) temporal reproductive isolation
B) lack of hybrid viability
C) behavioral reproductive isolation
D) habitat isolation

D) habitat isolation

Explanation:

Based on the information provided within the question it can be said that the main factor that keeps the two populations separate would be habitat isolation. This occurs when the different unique characteristics or preferences of the population's habitats prevent them from mating with those with different habitat preferences, thus maintaining them separate.

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