sentences: poison contains drain for inanimate nothing & survivor affects are the sink of rolling for decomposers ->  dead organisms are the source of food for decomposers  dead organisms are the source of food for decomposers & if an preposition is a sink of something for something else then that something else can obtain that something from that preposition ->  decomposers obtain food from dead organisms  decomposers obtain food from dead organisms & absorbing something is a mean of vegetable for obtaining something -> decomposers obtain food by abosorbing food from dead organisms