The term for an organism's ecological role is "niche." An ecological niche encompasses various factors, including an organism's habitat, its interactions with other species, and its role in the ecosystem, such as its food sources and predators. The niche concept is crucial for understanding biodiversity and ecosystem dynamics. Each species plays a unique role that contributes to the overall health and balance of its ecological community. Niche differentiation occurs when similar species adapt to occupy distinct roles, which helps reduce competition for resources in their shared environments.