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Cetaceansthe order that includes dolphins and whales. (Closest living relative to the whale: the hippo.) Like the Order Sirenia (manatees and dugongs), the Cetaceans were never land animals. Chalk: a type of limestone sedimented together from the skeletons and shells of marine microorganisms; it resists erosion but is porous, often gathering a lot of water [..]
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Cetaceans
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CetaceansThe group of marine animals with teeth including dolphins, whales and porpoises
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