Question

immunity can be long term or short term. a mother producing antigens to build her babies immune system is an example of:
active
passive

Explanation:

In immunology (a subfield of Biology, Natural Science), active immunity involves the body (here, the mother) producing antigens/antibodies to develop immunity. The mother producing antigens to build the baby’s immune system fits active immunity, as active immunity is when the immune system is stimulated to produce its own immune response (antigens/antibodies), unlike passive which is receiving pre - formed immunity.

Answer:

A. Active