Virus - Absolutely tiny. Not truly alive, consists of Genetic material surrounded by protein coat, Bacteria - Single celled, can produce toxins, affected by antibiotics, Fungi - Often a meshwork of hyphae, much larger, Antibodies - Proteins produced by lymphocytes that attach to pathogens, Antigens - Proteins on surface of pathogens that identify them as "non-self", Phagocytes - White blood cells that roam and engulf microbes, Lymphocytes - White blood cells that make antibodies,

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