Question

Bat, rat and cat belong to the class Mammalia and all have following common features

• A. All of them belongs to Mammalia.
• B. All of them have notochord at some stage of life cycle.
• C. All of them are warm blooded.
• D. All of the above.

Answer 1

The correct option is D All of the above.

• All have four-chambered hearts. And all of them have skin covered with hair and sweat and oil glands. These characters belong to group Mammalia. Therefore, option A is correct.
• All chordates have a notochord at some stage of their life cycle. Therefore, option B is correct.
• All mammals are warm-blooded. Therefore, option C is correct.

As all the above options are correct so, option D is correct.