Which of the following is a mammal? List a few mammalian characteristics.

Octopus

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Bat

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Crocodile

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Ostrich

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Solution

The correct option is C Bat
Bats are mammals. They have mammary glands for the production of milk to nourish their young ones.
Other characteristics of mammals are:
Their skin has hair as well as sweat and oil glands.
They are warm-blooded
They have four-chambered hearts.
They give birth to young ones directly without laying eggs (except platypus).
The octopus is a mollusc. The crocodile is a reptile and the ostrich is a bird.
So, the correct answer is option B.

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