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 that develops with exposure to various antigens. Antibodies crossing from baby to mother via placenta is not a real - occurring process. Usually, it's antibodies from mother to baby. Antibodies formed during pathogen exposure, immunizations, and antitoxin injections are all examples of acquired immunity as they involve the body's response to external antigens.

Answer:

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