Final answer:
IgG is the most abundant class of antibody in the body and has multiple functions in the immune response.
Step-by-step explanation:
The most abundant class of antibody in the body is IgG. IgG antibodies can function by neutralization, agglutination, opsonization, complement activation, and enhancement of natural killer cell activity.
IgG is a major antibody of late primary responses and the main antibody of secondary responses in the blood. It clears pathogens from the blood, can activate complement proteins, and fights extracellular pathogens.