Which description accurately describes a community?

• A. Two salamanders, three vines, four minnows, one robin
• B. A single species living in a habitat
• C. Only nonliving components like rocks and water
• D. A group of ecosystems in an area

Answer: (A)

In ecology, a community is all the living organisms in a defined area, across all species, that interact with one another. The description with different living things—a couple salamanders, vines, minnows, and a robin—shows multiple species coexisting in the same place, which is exactly what a community is. It captures the living components and their relationships in that habitat.

Having just one species would be a population, not a community. Nonliving components like rocks and water are abiotic factors, not a community. A group of ecosystems in an area describes a landscape or region, not a single community.