Answer:
Genetic variation.
Explanation:
It is caused by genes inherited from parents to offspring. It is a result of genetic information from parents.
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Minnesota, Wisconsin , iowa, Illinois, missouri, kentucky, arkansas, tennessee, lousiana, mississippi
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32%=0.32=8/25
66%=0.66=33/50
75%=0.75=3/4
50%=0.50=1/2
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