Metabolism
(a) The first law of thermodynamics applied to metabolism. Heat transferred out of the body (Q) and work done by the body (W) remove internal energy, while food intake replaces it. (Food intake may be considered as work done on the body. ) (b) Plants convert part of the radiant heat transfer in sunlight to stored chemical energy, a process called photosynthesis.
Source
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"OpenStax College, The First Law of Thermodynamics. February 12, 2013."
http://cnx.org/content/m42232/latest/
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