Final answer:
The subject of this question is Biology. The structures mentioned include the auricle (pinna), ear canal, and tympanic membrane. These structures are part of the outer ear and contribute to conducting sound waves.
Step-by-step explanation:
The subject of this question is Biology and the grade is High School.
The structures mentioned in the question include the auricle (also known as pinna), the external auditory canal (or ear canal), and the tympanic membrane (or eardrum).
- The auricle is the visible part of the ear and helps direct sound waves.
- The ear canal is a tube-shaped opening in the ear that sound waves travel through.
- The tympanic membrane is a thin membrane at the end of the ear canal that vibrates when sound waves hit it.
These structures are part of the outer ear, which is responsible for conducting sound waves into the middle ear.