Certified Indoor Environmental (CIE) Practice Exam 2026 – Your All-in-One Guide to Success!

An ecological niche is the combination of the ecological role and the space an organism fills in its ecosystem. It includes how it obtains resources (food, water, shelter), how it interacts with other species (predator, prey, competition, symbiosis), and the environmental conditions and timing it needs to survive and reproduce. In essence, it’s where an organism fits in the ecosystem and what it does there.

Geographic distribution is about where a species is found, not what it does or how it uses resources. Diet and feeding patterns are part of a niche, but the niche is broader, encompassing behavior, interactions, and requirements beyond just what it eats. Population size concerns how many individuals exist, not the organism’s functional role or habitat.