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How can a researcher increase the internal validity of an experiment?
Innate Immunity
An immune response that does not require a previous exposure to the pathogen.
T Cells
A type of white blood cell that plays a central role in the immune response, capable of identifying and eliminating infected cells.
B Cells
A type of white blood cell that plays a significant role in the adaptive immune response, producing antibodies against antigens.
Lymph Capillary
Tiny, thin-walled vessels located in the spaces between cells which serve to drain and transport lymph from tissues to the lymphatic system.
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