Multiple Choice
A researcher detects an increase in the amount of natural killer cells in a laboratory rat and concludes that ________.
A) the rat has, or recently had, a viral infection
B) the rat does not have any cancerous tumors
C) the rat's lymphatic system is not functioning properly
D) the rat's internal innate defenses are weakened
Correct Answer:
Verified
Correct Answer:
Verified
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