Bat, whale and human share the following trait

Hair

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Placenta

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Nocturnal

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Position of mammary glands

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Solution

The correct option is D Placenta
Bats, Humans, and Whales are all placental mammals and hence all have a placenta.
Whales do not have hair.
Only Bats are nocturnal among these 3.
Mammary glands of Whales are situated inside whereas in humans they are placed outside. In bats, the mammary glands are placed along the thoracic wall.
So the correct answer is 'Placenta'.

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