Fact 1: Passive immunity lasts only as long as the antibodies survive in body fluids.

Fact 2: Immunization can be active or passive.

Given the two facts above, answer the question "what can put antibodies in body fluids?" with the following options: 
- Chemical energy
 - animals
 - death
 - humans
 - h2o
 - immunization
 - mammals
 - collagen injections


 

      immunization   