Antigens are molecules that the immune system recognizes as foreign to the body.
Rejection is a normal reaction of the body to a foreign object.
Antigens are molecules that the immune system recognizes as needing to be rejected from the body.
Antigens are molecules that the immune system recognizes as needing to be what?

A) welcomed into the body
B) it needs them
C) stored in the body
D) accepted into the body
E) major threat to health
F) Something that causes allergies
G) rejected from the body
H) members of their own species