Some marine mammals such as the beaked whale and elephant seal can dive well over 4,000 feet deep, holding its breath, for two hours or more. What anatomical feature, lacking in humans, makes this possible?

Answer High levels of stored oxygen in their muscles.

Deep diving mammals have high levels of myoglobin a protein that bonds to oxygen, storing it in the muscles of the animals. When holding its breath the mammal can extract the oxygen from the myoglobin enabling them to stay at depth for long periods of time.

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