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Which of the following actually changed least during the 1800s?
Spleen
An organ involved in the production and removal of blood cells and part of the immune system.
Innate Immunity
A part of the immune system that provides immediate defense against infection but does not confer long-lasting or protective immunity to the host.
Adaptive Immunity
The component of the immune system that is characterized by memory and specificity, allowing for an enhanced response to subsequent encounters with antigens.
Memory Cells
Specific cells in the immune system that remember an antigen that the body has previously encountered, allowing a faster and stronger response upon re-exposure.
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