Passive immunity lasts only as long as the antibodies survive in body fluids, and antibodies are also called gammaglobulins. Given these facts, passive immunity lasts only as long as what survives in body fluids among the following options:
- Energy.
 - gammaglobulins
 - heat or cold
 - bacteria
 - Chemical energy
 - parasites
 - Leptospirosis
 - Veins and arteries.


 

  gammaglobulins       