Ravi knew that whales, dolphins, and sharks live in water, but was surprised to know that whales and dolphins are mammals and the shark is fish. Explain Why?
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Unlike fish, who breathe through gills, dolphins breathe air using lungs. Dolphins must make frequent trips to the surface of the water to catch a breath. The blowhole on top of a dolphin's head acts as a "nose," making it easy for the dolphin to surface for air.
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