You are presented with the question "What are needed after antibodies won't survive in body fluids?" and the following answer choices: 
- booster shots
 - Veins and arteries.
 - chicken pox
 - Energy.
 - gun shots
 - kinetic energy
 - diseased tissue
 - turn to a doctor

Now knowing that passive immunity lasts only as long as the antibodies survive in body fluids and booster shots are needed periodically to build up the passive immunity again, choose the best answer.


 

 booster shots        