Posted by riah on Thursday, November 6, 2008 at 9:41am.
Thank you for using the Jiskha Homework Help Forum. Some of the sites said 5 but this one said 6:
http://www.vedamsbooks.com/no21511.htm
Sra
There are actually 7:
1. Evolutionary ecosystem. 2. Concepts of ecology. 3. Ecosystem ecology. 4. Community ecology. 5. Major ecosystems of the world. 6. Marine ecosystems. 7. Geographical ecosystem
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