What is the difference between an antibody and an antigen?

Another difference between antigen and antibody is where they are. Antigens are “hooks” on the surface of cells and are found in nearly every cell. You can find IgA antibodies in the vagina, eyes, ears, digestive tract, breathing passages, and nose, as well as in blood, tears, and saliva.

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answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )