Which of the following is an example of black code (a) a secret symbol used to signify stops on the Underground Railroad (b)the fifthteenth amendment to the U. S constitution (c) a law prohibiting not allowing African Americans to serve on a jury (d) a law giving African Americans the right to hold a public office

the keystone school offers flexible education programs that each student achieve their unique dreams and goals. whether your student wants to study full time or just needs individual classes, we offer courses for grades k–12 from credit recovery to world languages and ap®. students can enroll at any time.

explanation:

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.