Song recommendations?

What is the purpose of the outer ear? a. to convert mechanical waves into electrical waves b. to evaluate the quality of sound c. to convert sound waves into mechanical waves d. to collect and focus sound waves

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Define function. define form. how do the two relate to one another?