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Tony's mother wants him to learn to play with other children. She begins by offering him a quarter whenever he plays with other children nearby, even if he plays by himself. Later, she gives him a quarter only when he plays on the same playground equipment other children are playing on. Finally, she gives him a quarter only if he actually plays with the other children. Tony's mother is demonstrating how to use
Antibodies
Proteins produced by the immune system in response to antigens, which help to identify and neutralize foreign objects like bacteria and viruses.
Macrophages
Large white blood cells that are an essential part of the immune system, responsible for detecting, engulfing, and destroying pathogens and dead cells.
Antigens
Foreign substances in the body that trigger an immune response.
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