Ecological Community Definition

Steps:

• Recall that ecology defines levels: organism, population (same species), community (multiple species populations), ecosystem (community plus environment).
• Identify key terms: community focuses on interacting populations of different species in a shared area.
• Compare choices to standard definition: exclude those adding environment (ecosystem) or limiting to counts (diversity).
• Select option matching populations of different species without extra elements.

Why B is correct:

• In ecology, a community is defined as all populations of different species interacting in a specific area or ecosystem, per standard biological hierarchy.

Why the others are wrong:

• A: Refers to individual organisms, not organized populations, making it imprecise.
• C: Describes species richness or biodiversity, not the community itself.
• D: Defines an ecosystem, which includes abiotic environment interactions.

Final answer: B