trigger -- n. something that causes something else to happen -- for example, a subject that requires a professor to warn students that some might find the discussion troubling

comfortable -- adj. not causing any unpleasant or troubling feelings

athlete -- n. a person who is trained in or good at sports, games, or exercises that require physical skill and strength

national anthem -- n. a song that praises a particular country and that is officially accepted as the country's song

survey -- n. an activity in which many people are asked a question or a series of questions in order to gather information about what most people do or think about something

index -- n. a number that shows how something is changing or performing

ugly - adj. unpleasant to hear

challenge -- v. to say or show that (something) may not be true, correct, or legal