We can see in food chains how the ecosystem moves through the ecosystem combining biological and physical elements in the environment. This energy flows through the ecosystem in form of organic elements. All the energy comes from the sun and it is loose in form of heat. This energy can not be recycle.

The scientist estimate that only 10% of energy is passed to first-level. We call this 10% rule.

Bibliography:

http://www.marietta.edu/~biol/102/ecosystem.html

http://www.education.com/reference/article/energy-flow-food-chain/

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