Final answer:
Passive immunity involves antibody transfer without immune response, benefiting fetuses and infants.
Explanation:
Passive immunity is the acquisition of antibodies without mounting an immune response. Naturally acquired passive immunity involves the transfer of maternal antibodies to a fetus through placenta or to an infant through breast milk, providing temporary protection. IgG antibodies are crucial in this process, crossing the placenta to protect the fetus and initiating immune defense in infants.
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