For example, in a food chain the lower serves the higher: grass nourished by mineral-rich soil is eaten by insects, which in turn are eaten by snakes and frogs, that are then eaten by birds and small carnivores.
(grass; is eaten; by insects) (insects; are eaten; by snakes and frogs) (snakes and frogs; are eaten; by birds and small carnivores; T:then) (grass; nourished; by mineral-rich soil) Context(grass nourished,List([58, 73))):(the lower; serves; )
grass nourished,List([58, 73))
grass insects snakes and frogs grass the lower
is eaten are eaten are eaten nourished serves
by insects
by snakes and frogs
by birds and small carnivores T:then
by mineral-rich soil