大象传媒

A look at food chains - green plants are eaten by herbivores which are then eaten by carnivores. A farm is looked at as an example - the sun feeds the wheat in the field which is then eaten by herbivores who are then eaten by carnivores and those by larger carnivores - possibly a buzzard or kestrel.The wheat being made into bread which is then eaten by humans is identified as a different type of food chain.