Q: Roundworms feed on various things, one of them being decaying organic matter.  doing this, they play an important role in what famous cycle?


Read this paragraph and choose the correct option from the provided answers:

Roundworms may be free-living or parasitic. Free-living worms are found mainly in freshwater habitats. Some live in soil. They generally feed on bacteria, fungi, protozoans, or decaying organic matter. By breaking down organic matter, they play an important role in the carbon cycle.

 Choices:

- life cycle

- soul cycle

- water cycle

- carbon cycle


A:
carbon cycle