Which of the following describes an organism that relies on consuming other organisms for energy?

The designation of "consumer" accurately describes an organism that obtains its energy by consuming other organisms. Consumers are part of a food chain where they feed on producers, such as plants, or other consumers. This vital role in the ecosystem facilitates energy transfer and nutrient cycling.

In contrast, producers, such as plants and certain algae, are capable of photosynthesis and can create their own energy using sunlight, whereas decomposers break down dead organic material and recycle nutrients back into the ecosystem. Autotrophs are another term for producers, specifically indicating organisms that generate their own food. Therefore, the term "consumer" is the only one among the choices that specifically refers to organisms that derive energy from consuming others.