What does the fifteenth amendment to the constitution say?

That states cannot limit the voting rights of individuals

Explanation:

apex

Changing to a later time provides some more time to sleep in during the morning. Students who are tired do not perform as well as students who are well-rested and ready to focus and learn. "Studies show that teenagers' bodies have a biological drive to stay awake fairly late at night, so early start times lead to a constantly overtired student population."