a microorganism is a kind of decomposer & a bacterium is a kind of decomposer ->  bacteria and microorganisms are kinds of decomposers  bacteria and microorganisms are kinds of decomposers & decomposition is when a decomposer recycles / returns nutrients / nitrogen from dead organisms to the soil by eating those dead organisms ->  bacteria and microorganisms return nutrients from dead organisms to the soil  bacteria and microorganisms return nutrients from dead organisms to the soil & soil is usually part of an environment ->  bacteria and microorganisms return nutrients from dead organisms to the environment  bacteria and microorganisms return nutrients from dead organisms to the environment & a living thing requires nutrients for survival -> living things require bacteria and microorganisms to return nutrients to the environment