Food chains and webs not only describe the order organisms are eaten, but they also describe the
flow of energy in an ecosystem
importance of the ecosystem
6 of the ecosystem
animals that are all related

Food chains and webs not only describe the order organisms are eaten, but they also describe the flow of energy in an ecosystem. We and all things are made of energy, so the way that energy change forms and pass from one thing to another is one way to describe an ecosystem, and more in general it is a correct way to explain how life on Earth works.

there's the proffessional site that will you.