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Question

Choose the correct answers from the alternatives given.
Which of the following is a true statement?

A
In all mammals, offspring develop within the female.
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B
All mammals have hair and mammary glands.
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C
All mammals are land-dwelling forms.
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D
All of the above.
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Solution

The correct option is B All mammals have hair and mammary glands.
Unlike other vertebrates, mammals nurse their young with milk produced by mammary glands. Though they're present in both males and females, in most mammal species mammary glands only fully develop in the females, hence the presence of smaller nipples on males (including male humans) also all mammals have hair at some point in their life. Not all mammals are land dwelling (dolphins)
So, the correct option is, 'all mammals have hair and mammary glands'.

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