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About 60 percent of the ocean is a cold, dark region that spans down to 11,000 meters. This zone is known as the deep ocean, and though it seems like an inhospitable and remote corner of the planet, it is actually one of the greatest habitats on Earth. Lidia Lins explores how so many species thrive in this mysterious underwater world.

Lesson by Lidia Lins, animation by Viviane Leezer.

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