Question

which of the following is not an example of acquired immunity?
a antibodies crossing the placenta from the baby to the mother
b antibodies formed during direct exposure to a pathogen
c immunizations
d an antitoxin injection

Explanation:

Acquired immunity is immunity developed after exposure to an antigen. Antibodies crossing from baby to mother via placenta is not a real - occurrence. Usually, antibodies cross from mother to baby. Antibodies formed during pathogen exposure, immunizations, and antitoxin injections are all examples of acquired immunity.

Answer:

A. antibodies crossing the placenta from the baby to the mother