| − | 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>USGS</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> |