what is jim crow? and which supreme court case upheld the constitutionality of these
laws?

In the early 1830s, the white actor Thomas Dartmouth “Daddy” Rice was propelled to stardom for performing minstrel routines as the fictional “Jim Crow,” a caricature of a clumsy, dimwitted black slave

Explanation:

Plessy v. Ferguson, 163 U.S. 537 (1896), was a landmark decision of the U.S. Supreme Court that upheld the constitutionality of racial segregation laws for public facilities as long as the segregated facilities were equal in quality – a doctrine that came to be known as "separate but equal".

the percentage of students at the school need special diets is

c) 10 percent

the catholic church withhold people's access to the bible during the middle ages.

people could go to church and listen to the teachings, but it was absolutely forbidden to own and/or read the books of both the old and new testaments. it was also prohibited to translate the books (which where originally in biblical hebrew) to any other language.

this was done so the church could remain in control of what their teachings were and to enhance their importance and power, while also being able to judge people's actions through information that was unavailable for the general public.