Which statement accurately describes the relationship between ecosystems and communities?

Which statement accurately describes the relationship between ecosystems and communities?

• A. Communities include only living organisms; ecosystems include living and nonliving components.
• B. Ecosystems include both living organisms and the nonliving components of the environment; communities include only living organisms.
• C. Ecosystems and communities both include only living organisms.
• D. Communities include nonliving components; ecosystems include living components only.

Answer: (B)

A community includes living organisms only, while an ecosystem includes living organisms and the nonliving environment. This distinction matters because ecosystems are built from both biotic components (the organisms and their interactions) and abiotic factors (like sunlight, temperature, water, minerals, and nutrients) that influence how those organisms survive, grow, and transfer energy. The statement that best describes this relationship is that ecosystems mix living things with the nonliving surroundings, whereas communities are just the living part. For example, a pond’s community comprises fish, insects, algae, and bacteria interacting with each other. The pond’s ecosystem also includes sunlight, oxygen levels, temperature, nutrient concentrations, pH, and other physical conditions that shape those interactions and the flow of energy through the system. The other options misstate either the presence of nonliving components in ecosystems or the inclusion of nonliving components in communities.

A community includes living organisms only, while an ecosystem includes living organisms and the nonliving environment. This distinction matters because ecosystems are built from both biotic components (the organisms and their interactions) and abiotic factors (like sunlight, temperature, water, minerals, and nutrients) that influence how those organisms survive, grow, and transfer energy. The statement that best describes this relationship is that ecosystems mix living things with the nonliving surroundings, whereas communities are just the living part. For example, a pond’s community comprises fish, insects, algae, and bacteria interacting with each other. The pond’s ecosystem also includes sunlight, oxygen levels, temperature, nutrient concentrations, pH, and other physical conditions that shape those interactions and the flow of energy through the system. The other options misstate either the presence of nonliving components in ecosystems or the inclusion of nonliving components in communities.