This comic shows the grass using the sun's energy for photosynthesis. Then the next frame shows a goat (a herbivore) eating the grass for it's energy. And finally, a little boy is having goat for lunch. Only 10% of the energy produced by the autotroph is passed on to the next trophic level, in this case it is the goat. The boy then gets only 10% of the energy produced in that goat.
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