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Post date	Users	Rates	Content
2013-11-26	deepali1234	70	Check this topic
2013-03-01	Vanan	95	Check this topic
2014-01-30	nishith	70	Check this topic
2014-01-31	poons	80	Check this topic
2013-12-08	visa0809	77	Check this topic

Topic title: using the example from the talk ,explain why elephants are consider a keystone species.

Topic category: TOEFL speaking