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It's efficient in some way that we can recycle the same energy over and over again without losing the energy made. Take this chart for example:

                          The sun is the main source of energy.
                       The plants grow through the help of the sun.
                          The plants convert the energy into food.
     Let's say a pig ate that plant. That pig then gains energy from the plant.
                    The pig is then turned into meat. We eat meat.
            And through that meat, we gain energy to do our daily activities.
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