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

If Assertion and Reason both are true and Reason is the true explanation of Assertion.

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If Assertion and Reason both are true but Reason is not the true explanation of Assertion.

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If Assertion is true and Reason is wrong.

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If Assertion is wrong and Reason is true.

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Solution

The correct option is B If Assertion and Reason both are true but Reason is not the true explanation of Assertion.
Bats and whales have a four-chambered heart and give birth to live young ones.

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

The correct option is B If Assertion and Reason both are true but Reason is not the true explanation of Assertion.Bats and whales have a four-chambered heart and give birth to live young ones.

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

The correct option is B If Assertion and Reason both are true but Reason is not the true explanation of Assertion.
Bats and whales have a four-chambered heart and give birth to live young ones.