The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the
a. inner ear.
b. middle ear.
c. outer ear.
d. auditory nerve.

The question is asking essentially about the location of the eardrum: if it asks where it is that eardrum vibrates, then it is also asking where there eardrum is located: and this is is in the middle ear: answer b.

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.