Question

which of the following statements is true concerning passive immunity? a passive immunity can last a lifetime. b passive immunity can result from immunization. c passive immunity results when an immune response to a pathogen produces memory cells. d passive immunity may be acquired by a fetus through its mother’s blood.

Explanation:

Passive immunity is the transfer of antibodies. It doesn't last a lifetime as in active - immunity. Immunization typically induces active immunity. Memory - cell production is part of active immunity. A fetus can acquire antibodies from the mother's blood, which is passive immunity.

Answer:

D. Passive immunity may be acquired by a fetus through its mother's blood.