10 Percent Rule Name: donna Location: N/A Country: N/A Date: N/A Question: There is a loss of energy at each step in a food chain. I was wondering what natural law does that illustrate? What structure is created by that process? Replies: Look up the Ecological Energy Pyramid and the 10 percent rule. This is what you are after. Steve Sample This sounds like a homework problem. I'll give you my answer, and you can try to explain it. The natural law it illustrates is the second law of thermodynamics; entropy is created in any natural trnasfer of energy. Richard E. Barrans Jr. This illustrates the law of entropy. This law observes that whenever there is a transfer or transformation of energy some of the energy is transformed into a form that is less useful (effectively 'lost' although it is not destroyed - only in a less useful form). You may be asking about energy pyramids. These are graphs that show the total energy found at each level of a food chain. The lowest level (producers) is the widest. With every upward step (first order consumer, second order consumer...) the pyramid becomes narrower as energy is lost fromt he system. I hope this information is useful. Cameron Millsom Click here to return to the Biology Archives

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