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What food chains are there? For example, owls eat snakes, snakes eat voles, and voles eat crops.
Grass, a rabbit, a fox and a wolf;
Plants-insects-insect-eating birds-eagles;
Rice → rice borer → frog → snake;
Phytoplankton → zooplankton → small fish → egret;
Big fish eat small fish, small fish eat shrimp, shrimp eat plankton, and plankton eat green algae.