The ____________________ immune system is a specific defense against parasites and internal diseases that exists only in vertebrate animals.
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Q52: A disease-causing agent is called a(n)_.
Q54: A lymphocyte is activated when unique _-binding
Q55: _ nodes are pockets that contain specialized
Q56: _ blood cells are a kind of
Q57: A vaccine contains
A)antibodies.
B)active B cells.
C)antigens.
D)active killer T
Q60: Macrophages and neutrophils make up a _
Q61: A vaccine stimulates the formation of _
Q62: When an item irritates the eyes, tears
Q63: In clinical studies, the control group receives
Q66: A fever is the product of an
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