Animals like mammals, birds and reptiles get their oxygen by breathing air, while animals like fish absorb the oxygen they need from water taken in through their gills," Koontz said. ... When diving, their heart rates slow to conserve oxygen and oxygen-rich blood is directed to key organs like the heart and lungs.
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they take oxygen to survive
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Animals like mammals, birds and reptiles get their oxygen by breathing air, while animals like fish absorb the oxygen they need from water taken in through their gills," Koontz said. ... When diving, their heart rates slow to conserve oxygen and oxygen-rich blood is directed to key organs like the heart and lungs.