The Yoruba tribe in Nigeria has the same likelihood of carrying the gene for Alzheimer's that individuals in the United States do, but they are less likely to experience Alzheimer's disease. Why?
a. Their diet has low levels of fats and sugars.
b. They live in less polluted areas.
c. They are not exposed to urban crowding.
d. They do not live long enough to have difficulties with Alzheimer's disease.
Answer: A
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When designing a cross-sectional study with different age groups, a researcher is concerned
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