a leaf is a part of a green plant & a plant is a kind of organism ->  a leaf is a kind of organism  a leaf is a kind of organism & if a leaf falls off of a tree then that leaf is dead ->  a fallen leaf is a kind of dead organism  a fallen leaf is a kind of dead organism & fungi break down fallen leaves into nutrients that enter the soil ->  fungi break down dead organisms into nutrients that enter the soil  decomposition is when a decomposer breaks down dead organisms & decomposition is when a decomposer recycles / returns nutrients / nitrogen from dead organisms to the soil by eating those dead organisms ->  decomposition is when a decomposer breaks down dead organisms into nutrients and returns them to the soil  decomposition is when a decomposer breaks down dead organisms into nutrients and returns them to the soil & decomposer is a kind of role in the food chain process / in an ecosystem ->  decomposer is a kind of role in the food chain process in which an organism breaks down dead organisms into nutrients and returns them to the soil  fungi break down dead organisms into nutrients that enter the soil & decomposer is a kind of role in the food chain process in which an organism breaks down dead organisms into nutrients and returns them to the soil -> in the food chain process fungi have the role of decomposer