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many things. one, energy source. For humans, that's food and oxygen. Oxygen is used in aerobic respiration, which produces about 32 ATP (which is energy that our body can use). Food contains nutrients and sugars that help produce energy. ATP can be used to restart the cycle, and break down food to yield more ATP/energy. As for something like plants, they use photosynthesis. This uses the Sun's light as energy to "kick-start" the energy process. they use Anerobic (as suppose to human's aerobic) respiration. this yield about 8 ATP (which as you can see, is less than the 32 ATP aerobic respiration yeilds). They then use that ATP to carry out all of it's functions, since ATP is energy.

So to sum it all up,Oxygen (only in aerobic respiration), ATP, light (sun's light), and Carbon are needed to produce energy.

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13y ago

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