What type of organisms needed to return the nutrients of a dead tree to the support?

Decomposers, such as fungi, bacteria, and detritivores like earthworms and certain insects, play a crucial role in returning the nutrients of a dead tree to the soil. They break down the organic matter in the tree, releasing essential nutrients like nitrogen, phosphorus, and potassium back into the environment. This process enriches the soil, promoting the growth of new plants and maintaining the overall health of the ecosystem.