Anatomy. The Egyptians knew the human body the best for a while. They only confused the purposes of the heart and brain, other than that, they were spot on.
The answer is B. Many people have jobs.
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Plessy v. Ferguson ruled that "Separate but equal" public facilities were constitutional, thus permitting the practice of segregation under Jim Crow laws in the South and separate facilities for African Americans.
Therefore, the correct answer is C, that the decision allowed Southern states to legally segregate facilities and institutions.