What is the purpose of the middle ear

A. To convert mechanical waves into electrical waves .

B. To evaluate the quality of sound

C. To collect and focus sound waves

D. To convert sound waves into mechanical waves

To convert sound waves into mechanical waves

Explanation:

first you need to pick out the favorite to the less favorite and have your pictures in a protector clear plastic then place your pics in the binder

explanation:

answer; i believe the correct answer is ( it gives the photographer greater control over the print)