Posted by kim on Thursday, September 13, 2007 at 8:02pm.
Since this is not my area of expertise, I searched Google under the key words "population community ecosystem definition" to get these possible sources:
http://www.answers.com/topic/ecosystems-1?cat=health
http://www.anselm.edu/homepage/jpitocch/genbios/ecologybi04.html
http://www.fi.edu/tfi/units/life/habitat/habitat.html
http://www.tierramerica.net/2000/1119/youknow.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
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