Question

what is best defined as an organism that \must consume another living thing to maintain its energy?\ autotroph producer heterotroph

Explanation:

To solve this, we analyze each term:

• Autotrophs (producers) make their own energy (e.g., plants via photosynthesis) and do not consume other living things for energy.
• Producers are the same as autotrophs, so they also don't consume other living things.
• Heterotrophs cannot produce their own energy and must consume other organisms (living or once - living) to obtain energy (e.g., animals, fungi).

Answer:

heterotroph