Define an ecological niche.

Explanation

**Step-by-Step Solution:**

1. **Definition of Ecological Niche**: An ecological niche refers to the role or function of an organism within its ecosystem, including its habitat, resource use, and interactions with other organisms.

2. **Habitat Component**: The niche includes the specific living place of the organism, which is often referred to as its habitat. This habitat consists of both biotic (living) and abiotic (non-living) components of the environment.

3. **Functional Relationships**: It is important to note that an ecological niche is not just about where an organism lives, but also about how it interacts with other organisms in its ecosystem. This includes relationships such as predation, competition, and symbiosis.

...