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Question

Which of the following is a mammalian feature and is not seen in other vertebrates?

A
Mammary glands
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B
Notochord
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C
Closed circulatory system
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D
All of the above
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Solution

The correct option is A Mammary glands
Mammals are characterized by the presence of mammary glands for the production of milk to nourish their young ones. All vertebrates have closed circulatory systems and possess a notochord during the embryonic period. The notochord is replaced by the vertebral column in the adults.
So, the correct option is A.

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