Question

The external ears of mammals

• A. Are also called pinnae
• B. Are absent in monotremes
• C. Can be moved in various direction by many mammals
• D. All of the above

Answer 1

The correct option is D All of the above

The external ear consists of an external flap (pinna) and auditory canal and is commonly called as pinna. External ears are present in all mammals except monotremes, a feature that links them with birds. Many mammals can move the external ear by its own and associated muscles to capture the maximum amplitude of sound waves and to discriminate between different sources of sound.

So, the correct answer is option D.