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A '''food chain''' is a diagram of the transfer of [[food]] energy from [[plant]]s to one or more [[animal]]s.  It is a series of plants and animals linked by their food relationships.<ref>http://www.nwrc.usgs.gov/fringe/glossary.html</ref>

A '''food chain''' is a diagram of the transfer of [[food]] energy from [[plant]]s to one or more [[animal]]s.  It is a series of plants and animals linked by their food relationships.<ref>http://www.nwrc.usgs.gov/fringe/glossary.html</ref> Energy becomes more concentrated as it passes up a food chain.

==References==

==References==