Multiple Choice
Figure 45-1
Use the figure to answer the corresponding question(s) . 
-The immune system component with a principal role at point B in Figure 45-1 is:
A) memory cells.
B) IgM antibodies.
C) IgG antibodies.
D) cytotoxic T cells.
E) antibody IgA.
Correct Answer:

Verified
Correct Answer:
Verified
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