Answer is B lymphocyte.
B lymphocyte becomes a plasma cell and also produces antibodies when activated by a T cell. Different B cell lymphocytes produce one unique antibody against one unique epitope, (An epitope is the specific binding site/target on which an individual antibody binds).
Changes to the classification system have meant that the classification of some species of organisms has changed too. The system had to be changed to incorporate this new group or organisms.
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Answer:
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