The specific role of organisms within an ecosystem is called what?

• A. Mineral
• B. Niche
• C. Noble gas
• D. Non renewable

Answer: (B)

The niche is the role an organism plays in its ecosystem—the job it does, including what it eats, how it obtains energy, how it interacts with other species, and how it contributes to energy flow and nutrient cycling. It’s different from the habitat, which is the place where the organism lives; a species can share a habitat with others but occupy a different niche through different foods or activities. For example, in a forest, one organism might feed on leaves while another feeds on seeds, and another may be active at night—these differences in role reduce direct competition and help the community function smoothly. The other terms aren’t about the role of living things: a mineral is a non-living substance, a noble gas is a category of elements, and non-renewable refers to resources that can’t be replenished quickly. Therefore, the term that fits best is niche.