Final answer:
Detritivores feed primarily on dead plant or animal matter and play an important role in recycling nutrients back into the environment.
Step-by-step explanation:
A detritivore is an organism that feeds primarily on dead plant or animal matter. They play an important role in the ecosystem by breaking down organic debris, such as dead leaves and animal feces, and recycling nutrients back into the environment. Examples of detritivores include earthworms, dung beetles, sea cucumbers, and catfish.