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The changing planet

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Across
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They are diverse underwater ecosystems formed primarily from calcium carbonate secreted by corals.
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This animal is highly intelligent marine mammals belonging to the catacean family, which also includes whales and porpoises.
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They have hard exoskeleton that provides protection and support for their bodies.
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This animal has an incredible sense of smell, with some especies capable of detecting a single drop of blood in a million parts of water.
Down
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This animal is one of the most largest species. they can grow up to 100 feet(30 meters) in leght and weight.
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This animal has a unique gelatinous body structure compose of over 95% water.
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It covers more than 70% of the Earth's surface with water.
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They are considered one of the most intelligent invertebrates, with complex problem solving abilities, learning capabilities, and even short term memory.