Dyahaha Just think of an aquatic animal or even a mammal then the food they eat ranging from planktons to seals then add them together like how at least one animal eats similar prey. Now how about a krill eating algae off a seaweed  then swallowed by a milk fish and a seal then the seal is devoured by a polar bear and a milk fish is eaten by a great white shark and the krills are also being swallowed by a humpback whale and the great white also eats a salmon that was eating jellyfish and a turtle also eats the a jellyfish. Then continue and so one..just make a chain instead of a typical line.. (I.just.did.your.homework.kid..*hisses, now bow down to me)