This question has two parts. First, answer part A. Then, answer part B. Part A:
Why does the author examine the issue of slavery at the beginning of the article?

A.
to discuss the rise of California as a major state

B.
to show the conflict between states and territories

C.
to discuss the effects of a labor shortage on farming

D.
to show the growing division between the North and the South

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

What’s the student’s scientific question

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.