Charissia drew the following diagram to describe the levels of structural organization of an animal's body. She will list the cell as both the
least specialized and the most numerous at the bottom of the pyramid.
Which of the following should she list in level 3 on the diagram?*
Levels of Organization of an Animal's Body
Increase in
specialization
1
2
3
4
Increase
in number
5
don
A. organ
B. tissue
C. organism
D. organ system