Which group breaks down dead matter and returns nutrients to the ecosystem?

Which group breaks down dead matter and returns nutrients to the ecosystem?

• A. Producers
• B. Decomposers
• C. Consumers
• D. Apex predators

Answer: (B)

When nutrients cycle through an ecosystem, breaking down dead matter and returning those nutrients to be reused by living things is done by decomposers. These organisms, like certain bacteria and fungi (and some detritivores such as earthworms in a broader sense), feed on decaying plants, animals, and waste. As they break down this material, they convert complex organic compounds into simpler substances that become part of the soil, water, or atmosphere, making nutrients like carbon, nitrogen, and phosphorus available again for producers to use in photosynthesis and growth. Producers are the plants and algae that make their own food from sunlight. Consumers are the animals that eat other organisms, and apex predators are top-level consumers with no natural predators of their own. The role described here—breaking down dead matter and returning nutrients—fits decomposers, which is why they are essential for keeping nutrients cycling and the ecosystem healthy.

When nutrients cycle through an ecosystem, breaking down dead matter and returning those nutrients to be reused by living things is done by decomposers. These organisms, like certain bacteria and fungi (and some detritivores such as earthworms in a broader sense), feed on decaying plants, animals, and waste. As they break down this material, they convert complex organic compounds into simpler substances that become part of the soil, water, or atmosphere, making nutrients like carbon, nitrogen, and phosphorus available again for producers to use in photosynthesis and growth.

Producers are the plants and algae that make their own food from sunlight. Consumers are the animals that eat other organisms, and apex predators are top-level consumers with no natural predators of their own. The role described here—breaking down dead matter and returning nutrients—fits decomposers, which is why they are essential for keeping nutrients cycling and the ecosystem healthy.