Studies by Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins can induce the synthesis of antitoxins in the blood of rabbits. These antitoxins (antibodies) are the basis of ________.
A. phagocyte-mediated immunity
B. antibiotic immunity
C. cell-mediated immunity
D. humoral immunity
Answer: D
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In a lichen that is in a mutually beneficial relationship, what does the photobiont usually receive?
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