The sun's energy ( solar energy ) is required for photosynthesis in which a plant (containing chlorophyll) produces food as an autotroph. This is now chemical energy stored within the plant. When an animal eats the plant this energy is transferred to the animal. This cycle continues according to the hierarchy of the food chain of the fresh water habitat wherein a fish eagle may eat a fish that consumed a frog which fed on a bug that ate a lily leaf.
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