21.7: Chapter 7
( \newcommand{\kernel}{\mathrm{null}\,}\)
Multiple Choice
1. a
3. c
5. b
7. a
9. d
11. d
13. a
15. b
17. b
19. a
21. b
23. d
Fill in the Blank
1. Eustachian tube(s)
3. VIII
5. plasticity