In response to an unknown trigger, the immune system may begin producing antibodies that instead of fighting infections, attack the body's own tissues. Treatment for autoimmune diseases generally focuses on reducing immune system activity.
What's taught in school. Some of the items in standardized achievement tests measure the knowledge or skills that students learn in school. In certain subject areas, such as mathematics, children learn in school most of what they know about a subject.
Any test in which the same test is given in the same manner to all test takers is a standardized test. Standardized tests do not need to be high-stakes tests, time-limited tests, or multiple-choice tests.