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Which well-known economist from the past asserted that "the power of population is infinitely greater than the power in the earth to produce subsistence for man?"
Antigens
Substances that the immune system recognizes as foreign, triggering an immune response; often parts of pathogens like bacteria, viruses, or fungi.
Toxins
Poisonous substances produced by living cells or organisms that can cause disease when introduced into the body tissues.
Complement System
A part of the immune system that enhances (complements) the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism.
Clonal Selection
Lymphocyte activation in which a specific antigen causes activation, cell division, and differentiation only in cells that express receptors with
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