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It depends on the mammal. All mammals have lungs, which are what actually takes the oxygen from the air and gives you energy. How the oxygen gets there can vary. Most land mammals have a mouth and nose, both of which are connected to the lungs. Whales, dolphins, and many aquatic mammals use blow-holes on the top of their heads. It's easier for them to peek out of the water and breath like that.

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13y ago

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