What is the main idea of the following passage?
"The vast oceans cover more than 70% of Earth's surface and are home to an incredible variety of life. They provide food, regulate the climate, and offer recreational opportunities, making them essential to human survival."
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A
Oceans are dangerous and should be avoided.
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B
Oceans are vast and important to life on Earth.
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C
Oceans are primarily for recreation.
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D
Oceans are unexplored and mysterious.