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Earth Sciences 21 Online
OpenStudy (anonymous):

WILL FAN AND MEDAL YOU IF HELP! ITS SCIENCE Human activities have changed environmental conditions and upset the balance of ecosystems. Tell why humans clear forested land, and then discuss the consequences of deforestation.

OpenStudy (anonymous):

http://www.globalissues.org/article/171/loss-of-biodiversity-and-extinctions This should help. It talks all about bio diversity.

OpenStudy (anonymous):

Hope it helped because that's what helped me when i was learning about that.

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