A substance that when introduced into the body stimulates the production of an antibody?

Are people more motivated to change from positive or negative experiences, like slavery, womens rights, and any other historical movements/moments? i need more factual information than opinions.

Astudent receives a pell grant based on the_.a.satb.nasac.fafsad.act

Acase study allows a more detailed look at the life of a single subject than any other study