Biology

The correct answer is: B.Postzygotic

Explanation:

Postzygotic reproductive isolating mechanisms (RIMs) act after fertilization of the egg by the sperm. These mechanisms affect the viability or fertility of the resulting offspring, and include:

1.Hybrid inviability: The hybrid offspring fail to develop properly or die early.

2.Hybrid sterility: The hybrid offspring are sterile (e.g., mules, which are sterile hybrids between horses and donkeys).

3.Hybrid breakdown: The hybrid offspring are fertile but produce inviable or sterile desc...