. Assertion: Bats and whales are classified as mammals.
Reason: Bats and whales have four-chambered heart.
Ans || (b)
Solution ||| Bats and whales are the members of class Mammalia (L. Mamma = breast). The bats are the only mammals which have wings and can really fly, while whales are the largest animals in existence. Both bats and whales have four chambered heart but birds and crocodiles also have four chambered heart. Therefore, assertion and reason both are true and reason is not the correct explanation of assertion