Question

what is the role of a consumer in an ecosystem?
eat other living things
break down dead organic matter
all of these
make food

Explanation:

Consumers are organisms that obtain energy by eating other living things. Decomposers break down dead organic matter, producers make food (usually through photosynthesis), and since only "Eat other living things" fits the role of a consumer, the other options (Break down dead organic matter, All of these, Make food) are incorrect.

Answer:

Eat other living things