Select your answer:

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Terms and Definitions - Diseases › Viewa rounded mass of tissue that filters fluids from other body tissues and traps pathogens
A. lymph node
B. immunity
C. active immunity
D. passive immunity
E. lymph nodes, adenoids, spleen, bone marrow, lymphatic vessels, tonsils, thymus, appendix
Disease & Immunity › View
Name the system that will directly respond to these vaccines.
A. Excretory
B. Digestive
C. Immune
D. Endocrine