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Which of the following is NOT an opportunity cost of attending college?
MHC Markers
Proteins found on the surface of cells that help the immune system recognize foreign substances.
Active Immune Response
The body's defense mechanism that is activated by exposure to pathogens, involving the production of antibodies and memory cells.
Low pH
A measurement indicating that a solution is acidic, having a pH value less than 7.
Pathogens
Microorganisms that cause disease in their host, including viruses, bacteria, fungi, and parasites.
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