Compared to a human, a diving mammal of equal size has:

less blood, an adaptation that helps to conserve oxygen

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larger lungs

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a larger spleen

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less oxygen stored in blood

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Solution

The correct option is C a larger spleen
Diving mammals have larger spleen as compared to normal; the larger spleen has the ability to store 2/3 of the body's erythrocytes at rest.
So, the correct option is 'a larger spleen'.

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