Which group includes organisms that feed on decaying organic matter?

• A. Decomposers
• B. Producers
• C. Consumers
• D. Parasites

Answer: (A)

The main idea here is how energy and matter move through an ecosystem through feeding roles. Decomposers break down dead and decaying organic matter by secreting enzymes that release simple nutrients, which they then absorb. This process recycles nutrients back into the environment, making them available for producers to reuse. Fungi and bacteria are classic examples, with some detritivores contributing as well.

Producers create their own organic matter from energy sources like sunlight or chemical energy, so they aren’t feeding on decaying material. Consumers obtain energy by eating other organisms, not detritus. Parasites live on or in living hosts, feeding on them, often harming the host. Because decomposers specialize in consuming and breaking down dead material to release nutrients, they are the group described.