how does a sea animal like dolphin survive in water without gills
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Dolphins are marine mammals and just like land dwelling mammals they require air to breathe. Unlike fish, which are non mammalian animals, dolphins do not possess gills(gills allow fish to extract oxygen from the water) so they must come to the surface of the water to breathe.
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Whales and dolphins are mammals and breathe air into their lungs, just like we do. They cannot breathe underwater like fish can as they do not have gills. ... After each breath, the blowhole is sealed tightly by strong muscles that surround it, so that water cannot get into the whale or dolphin's lungs.
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