Select the correct answer.
in 1943, a british soldier recovered from an infected wound. which scientific discovery could have heal his infection?
a.
vaccine
b.
syringe
c.
penicillin
d.
inoculation

About how many european immigrants were processed at the facilities on ellis island

Which landmark supreme court case ruled that segregation by race in public education was unconstitutional? a.miranda v. arizona b.plessy v. ferguson c.brown v. board of education of topeka d.alexander v. holmes county board of education

Profits are maximized when marginal revenue and marginal costs are a. set c. equal b. less than market price d. greater than market price