Which of the following best describes adaptive immunity?

W) It includes external barriers such as secretions from mucous membranes

X) It is found in both vertebrates and invertebrates

Y) It involves the lymphatic system

Z) It includes an interaction of pathogens, antibodies, and lymphocytes [LIM-fuh-syts]
Z) IT INCLUDS AN INTERACTION OF PATHOGENS, ANTIBODIES, AND LYMPHOCYTES