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    Biology Study Set 14
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    Exam 45: The Immune System: Internal Defense
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    A Key Component That Is Always Important in the Proper
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A Key Component That Is Always Important in the Proper

Question 76

Question 76

Multiple Choice

A key component that is always important in the proper functioning of the immune system is:


A) direct cell to cell contact.
B) hormonal action.
C) communication between cells.
D) antibody action.
E) perforins.

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