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When did the ocean become an important area of study?

A. about 1,000 years ago
B. about 500 years ago
C. about 2,000 years ago
D. about 200 years ago

2 Answers

7 votes
The answer is D. about 200 years ago
User Hyponym
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6 votes
D. Around 200 years ago
User Maddie
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