Which statement correctly defines a biological community?

• A. A single species living in an area
• B. All living and non-living components of the environment
• C. The population size of the dominant species
• D. An assemblage of populations of different species living in a given area

Answer: (D)

A biological community is the assemblage of populations of different species living in a given area. This means all the living organisms of various species that share a habitat and interact with each other, through feeding, competition, predation, and symbiotic relationships. It’s about how many species are present and how they relate, not just the presence of one species or the abiotic environment.

Why this is the best definition: it captures the essence of a community as a network of interacting populations within a shared space. It excludes the non-living components that define an ecosystem, and it goes beyond a single species or a metric about one population.

In contrast, having just one species describes a population, not a community. Including both living and non-living components refers to an ecosystem. Focusing on the population size of the dominant species looks at a single population metric, not the full set of species and their interactions.