Which of the following is generally considered true of an ecosystem?

• A. Ecosystems consist only of plants, animals & fungi in an environment.
• B. Energy in an ecosystem is transferred from predators down the food chain to producers.
• C. Ecosystems take up relatively small areas, always less than 1 square kilometer.
• D. Ecosystems consist of biotic (e.g. plants, animals) & abiotic (e.g. water availability, soil composition) factors