Antigens are molecules that the immune system recognizes as foreign to the body, and molecules are a group of atoms. Given these facts, what type of antigens does the immune system recognize as foreign to the body among the following options:
- animals
 - epidermal
 - Allergies
 - negative
 - dangerous
 - graptolites
 - group of atoms
 - homogenous


 

       group of atoms  