Answers

2014-08-04T18:31:12+08:00
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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