Fact 1: Antibodies are large, Y-shaped proteins that recognize and bind to antigens.

Fact 2: Antibodies are produced to fight antigens.

Given the two facts above, answer the question "what do proteins fight?" with the following options: 
- heat
 - calories
 - carbohydrates
 - illness
 - parasites
 - fat
 - resistance
 - antigens


 

        antigens 