Which of these is an example of passive immunity?
• a person develops antibodies to fight off an ear infection
• antibodies are passed from a pregnant woman to an infant through breast milk
• a person develops antibodies against the measles vaccine
• A person is vaccinated for hepatitis B

woman to an infant through breast milk

Explanation:

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the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.