Our oceans cover more than 70% of Earth's surface and over 70% of the oxygen we breathe is produced by marine plants

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Our oceans cover more than 70% of Earth's surface and less than 5% of our planet's oceans have been explored. The majority of life on Earth is aquatic. Over 70% to 80 % of the oxygen we breathe is produced by marine plants, nearly all of which are marine algae.