Question

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

Explanation:

• A producer (or autotroph) is an organism that can make its own food (e.g., plants via photosynthesis) and does not need to consume other living things for energy.
• A heterotroph is an organism that cannot produce its own food and must consume other living organisms (either plants, animals, or other heterotrophs) to obtain energy. This matches the description in the question.

Answer:

heterotroph