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Category:Ecology & Category:Biology
An ecosystem where all water runoff drains into a single river or stream.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia
An [[ecosystem]] where all [[water]] runoff drains into a single river or stream.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia
Educational Ministries, Inc. 1998</ref>
Educational Ministries, Inc. 1998</ref>
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[[Category:Ecology]]