Jack wants to test whether runners on his cross-country team improve with his new training regimen. He measures their run times at the beginning of the season and again at the end of the season. Runners in Jack's study improving their times due to running generally and not necessarily due to the new regimen is an example of which of the following threats?a. Selection
b. Maturation
c. History
d. Instrumentation

37. pan shot – across the street down the row of houses 37. each is the same in general style, the front porch, the gliders, the rest of it. then suddenly the camera stops on the last house in the line. there's a spot light set up on the porch and even in the daylight we can see it shining. which element of drama is highlighted in this stage direction?

Writing prompt: read the article, “ending school segregation in the us.” why is the event described in the article taught in schools today? what are the lasting lessons that we can learn from studying this event? support your response with textual evidence. 1. read the article. 2. consider the answers to the questions. 3. use the race graphic organizer to organize your thoughts. 4. construct a paragraph using the race writing including textual evidence (see textual evidence notes for assistance with how to include this information) from the article and answers to the question. 5. check for capitalization, punctuation, and grammar.

The tea party movement is a. an official third party that challenges both democrats and republicans in national elections. b. an organized challenge to incumbents in the republican party by the most conservative wing of the republican party. c. an organized challenge to incumbents in the democratic party by the most liberal wing of the democratic party. d. an offspring of the green party that runs for state and local office in many midwestern states. e. the now defunct party that gave way to the republican party at the end of the “second party system.”