Answer :

vanessness
Food chain is a single line of animals that consume one another and a food web is the interconnections of animals that consume one another. The picture to the left is a food chain, the one to the right is a food web.  
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desthermitcrab

A food chain is the passing of energy from one type of organism to another.

For example: Grass ----- Rabbit ----- Hawk

A food web is a combination of food chains that overlap.

Look at the attachment below for an example.

View image desthermitcrab