Plants divide water and the pieces of the water combine with carbon dioxide to make sugar. Plants and animals use sugar as energy to live.
When plants or animals need to use sugar for energy, the sugar gets divided and its pieces basically turn back into water and carbon dioxide.
Animals can’t use carbon dioxide to make sugar the same way that plants can, so we get rid of it. It goes to our lungs and gets traded for oxygen in the air when we breathe. We use the oxygen to help make energy, and it gets turned into water.
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