Question

which is an example of active immunity?
immunity produced in a baby by a nursing mother
immunity produced by the injection of a vaccine
immunity produced in a baby during pregnancy
immunity produced by injection of animal antibodies

Explanation:

Active immunity is when the body produces its own antibodies. A vaccine contains weakened or dead pathogens. When injected, it stimulates the body's immune system to produce antibodies. Immunity from a nursing mother (through breast - milk antibodies), during pregnancy (placental transfer of antibodies), or injection of animal antibodies (passive transfer of pre - formed antibodies) are examples of passive immunity.

Answer:

Immunity produced by the injection of a vaccine