6. Which of the following cell types are responsible for initiating a secondary immune response? (A)stem cells (B) B cells (C)memory cells (D)T cells

20. An advantage of asexual reproduction is that it(A) allows the species to endure long periods of unstable environmental conditions(B) enhances genetic variability in the species(C) enables the species to flourish in stable habitats that are favorable to that species(D) produces offspring that respond effectively to new pathogens(E) allows a species to easily rid itself of harmful mutations

6. Which of the following cell types are responsible for initiating a secondary immune response?
(A)stem cells
(B) B cells
(C)memory cells
(D)T cells

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