The Professor gives examples of the effects of elephants on the African grasslands habitat. Using the examples from the talk, explain why elephants are considered a keystone species.

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The Professor gives examples of the effects of elephants on the African grasslands habitat. Using the examples from the talk, explain why elephants are considered a keystone species.

Submitted by Vanan on Fri, 03/01/2013 - 02:00
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TOEFL speaking

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