The immortal jellyfish can revert back to its juvenile state after reaching maturity, theoretically living forever.
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The Great Barrier Reef supports thousands of marine species.
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The giant squid can grow over 30 feet long.
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The Pacific Ocean covers nearly one-third of Earth's surface.
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Many deep-sea fish have transparent or nearly invisible bodies.
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The Pacific Ocean is larger than all of Earth's continents combined.
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