12. which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound waves? a. impulses have to be sent to the brain through the auditory nerve. b. the brain has to interpret the direction from which the sounds are being delivered. c. vibrations have to be transmitted to the fibers of the auditory nerve. d. the outer ear has to collect the sound waves and lead them to the middle ear.

The outer ear has to collect the sound waves and take them to the middle ear.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.