Select your answer:
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Adaptive Immune System › ViewWhat is a naive B or T Cell?
A. A cell that has been selected and has undergone clonal selection
B. A cell that is yet to encounter its complementary antigen
C. Another name for a B or T memory cell
D. A cell that doesn’t have the receptors needed to fit any antigens
Excretion › View
Which of the following kinds of animals excrete their nitrogenous waste entirely as ammonia?
A. Birds
B. Tropical insects
C. Insects
D. Fish