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

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it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.

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