1. "The antibodies on the surface of B cells bind to antigens, and the B cells grow and divide, producing plasma cells" is the one among the following choices that <span>best describes what causes plasma cells to form during a humoral immune response. The correct option among all the options that are given in the question is the second option or option "b".
2. "Testes" is the structure among the following choices that </span><span>would be most likely to result in an increase in mutations in a man's sperm cells. The correct option among all the options that are given in the question is the second option or option "b".</span>
