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The changing planet

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