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

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11