Final answer:
False. Adaptive immunity is not provided only by lymphocytes that secrete antibodies. Both B cells and T cells are involved in adaptive immune responses, but they play different roles.
Step-by-step explanation:
False. Adaptive immunity is not provided only by lymphocytes that secrete antibodies. While B cells play a major role in humoral immunity by secreting antibodies that bind to antigens, T cells have several functions in the adaptive immune response, including the secretion of soluble factors and the destruction of infected cells. Both B cells and T cells are involved in adaptive immune responses, but they play different roles.