Populations can be categorized by the functions they serve in an ecosystem: producers (make their own food), consumers (obtain food by eating other organisms), and decomposers (use waste materials).
(they; serve; L:in an ecosystem) (producers; make; their own food) Context(producers make,List([76, 91))):(Populations; can be categorized; by the functions) Context(producers make,List([76, 91))):(producers; make their own food by eating; other organisms) (consumers; obtain; food)
producers make,List([76, 91)) producers make,List([76, 91))
they producers Populations producers consumers
serve make can be categorized make their own food by eating obtain
L:in an ecosystem
their own food
by the functions
other organisms
food