Which of the following is not a mammalian character?

Hairy skin

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Muscular diaphragm

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3-chambered heart

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Large brain

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Solution

The correct option is C 3-chambered heart
Mammals are characterised by the presence of mammary gland, placenta, the ability to give birth to young ones, skin with hairs, four-chambered heart and lungs with the muscular diaphragm. The three-chambered heart is the characteristic feature of reptiles and amphibians.
Hence, the correct answer is option C.

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