A living thing that eats dead or decayed matter for energy is called a decomposer.

Here are some examples of decomposers:

* Bacteria: These tiny organisms break down dead plants and animals into simpler substances.

* Fungi: Mushrooms, molds, and yeasts are examples of fungi that also break down dead matter.

* Worms: Earthworms and other types of worms play a vital role in decomposing organic matter in soil.

* Insects: Some insects, like beetles and flies, help decompose animal carcasses.

Decomposers are crucial to the ecosystem because they recycle nutrients back into the environment, allowing for the growth of new plants and the support of other organisms.