* Fungi are decomposers: They break down dead organic matter (plants and animals) and release nutrients back into the ecosystem. This is a crucial role in the cycling of matter.

* Animals are consumers: They obtain energy by eating other organisms (plants or other animals).

* Bacteria: While some bacteria are decomposers, others are producers (like photosynthetic bacteria) or even parasites.

* Plants are primary producers: They use photosynthesis to convert sunlight into energy and make their own food. This is the basis of most food chains.

Let me know if you have more questions about the cycling of matter and energy!