AP Environmental Science

Answer: B - No two species can occupy the same niche.

Key Takeaway: The niche is the specific role a group of one species in an area. If two groups share a niche, competition ensues. In ecology, smaller units combine to form larger ones. A group of a single species is a population, and groups of populations exist in a community. The niche defines the role each population plays in a community. The niche defines every aspect of an organism, including lifespan, size, morphology, and place in the food chain.