Source: Official Guide for GMAT Review 2016 Sentence Correction; #66

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Covering 71 percent of Earth’s surface, the oceans

Covering 71 percent of Earth’s surface, the oceans play an essential role in maintaining the conditions for human existence on land, moderating temperature by the absorption of heat and carbon dioxide, and giving pure water back to the atmosphere through evaporation.

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Section 9.6 Sentence Correction

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