sentence2_structure: The immune system<>typically recognizes<>$$$The immune system<>destroys<>foreign cells or substances that may cause disease$$$foreign cells or substances<>may cause<>disease
sentence1: that is, factors in the immune system, including antibodies, attack cells in the person's own body as if they were foreign substances.
sentence2: The immune system typically recognizes, attacks, and destroys foreign cells or substances that may cause disease.
question: Which body system typically recognizes, attacks, and destroys foreign cells or substances that may cause disease?