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Q.

Assertion (A) : Bats and whales are classified as mammals.Reason (R) : Bats and whales have a four-chambered heart.

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a

Both A and R are true and R is the correct explanation of A.

b

Both A and R are true but R is not the correct explanation of A.

c

A is true but R is false.

d

Both A and R are false.

answer is B.

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Detailed Solution

Bats and whales are classified as mammals due to presence of mammary glands.Bats and whales have a four chambered heart. A four-chambered heart is also present in some other vertebrates like crocodiles and birds.
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