If asked to sort cards of immune responses into boxes marked "active immunity" and
"passive immunity," which of the following cards would go into the "passive
immunity" box?
Antibodies produced from a vaccine.
Antibodies produced from a vaccine, and a person receiving an injection of
antibodies.
A fetus acquiring antibodies through the placenta.
A fetus acquiring antibodies through the placenta, and a person receiving an
injection of antibodies.