marine mammals, which are air breathers, can swim for hours at the surface of the water with minimal negative affect. If they dive deeper in the water for periods of time they are lost likley in pain.

marine mammals, which are air breathers, can swim for hours at the surface of the water with minimal negative affect. If they dive deeper in the water for periods of time they are lost likley in pain. Explain why there would be such a difference?

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