dead organisms are a kind of waste & dead organisms are the source of nutrients for decomposers ->  waste is a source of nutrients for decomposers  waste is a source of nutrients for decomposers & if an object is a source of something for something else then that something else can obtain that something from that object ->  decomposers obtain nutrients from waste  decomposers obtain nutrients from waste & eating / digestion is when an organism takes in nutrients from food into itself by eating ->  decomposers obtain nutrients by eating waste  decomposers obtain nutrients by eating waste & eating is a kind of method for consuming ->  decomposers obtain nutrients by consuming waste  decomposers obtain nutrients by consuming waste & a decomposer is a kind of living thing ->  a decomposer is a kind of living thing that obtains nutrients by consuming waste  a decomposer is a kind of living thing that obtains nutrients by consuming waste & classifying is when one sorts something by kind / type -> a living thing that obtains nutrients by consuming waste can be classified as a decomposer