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U.S stock market C.

The effects of the wall street crash was because of global economical problems. The Wall Street crash was because of the Great Depression (because they are connected) in 1929, in fact government warned that the American economy was slowing down. The investors started selling shares in large numbers and after the crash they couldn't afford paying off the debts. 

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Explanation:

answer; for children with two myopic parents,the likelihood of becoming myopic is ) correlated with the number of hours spent playing sports each week;