Question

what is the use of studying food chain

Answer 1

A food chain shows how energy is transferred from one living organism to another via food. It is important for us to understand how the food chain works so that we know what are the important living organisms that make up the food chain and how the ecology is balanced.
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Answer 2

studying the food chain gives us an idea of how different organisms are interdependent on each other and how the energy flows form sun to animals and plants.