21.4: Chapter 4
( \newcommand{\kernel}{\mathrm{null}\,}\)
Multiple Choice
1. c
3. b
5. c
7. c
9. a
11. b
13. b
15. a
17. d
19. d
21. a
23. a
Fill in the Blank
1. model organism or model system
3. allometry
5. electron microscopy