Most energy comes from the sun, either directly or indirectly
Most life forms on earth get their energy from the sun. Plants use photosynthesis to capture sunlight, and herbivores eat those plants to obtain energy. Carnivores eat the herbivores, and decomposers digest plant and animal matter.
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"OpenStax College, Energy and Metabolism. October 26, 2013."
http://cnx.org/content/m44422/latest/
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