4. What is the author's main purpose in the text? A to argue that all schools should start later in the day
B to warn teens about the dangers of staying up late
O c to compare the sleep patterns of teens and adults
OD to explore what the right amount of sleep is for
teenagers

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Explanation:

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in the 1890s, southern states enacted a new form of black codes, called “jim crow” laws. these laws made it illegal for blacks and whites to share public facilities. this meant that blacks and whites had to use separate schools, hospitals, libraries, restaurants, hotels, bathrooms, and drinking fountains.

explanation:

the answer is b. the tracer looks harmless in flight, but the pilot’s bitten lips and white knuckles suggest how dangerous it can be.