All living things use carbohydrates as a form of energy.
Plants, like this oak tree and acorn, use energy from sunlight to make sugar and other organic molecules. Both plants and animals (like this squirrel) use cellular respiration to derive energy from the organic molecules originally produced by plants
Source
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"OpenStax College, Energy and Metabolism. October 16, 2013."
http://cnx.org/content/m44422/latest/Figure_06_01_02.jpg
OpenStax CNX
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