Muhammad left Mecca to live in Medina because B. <span>he feared for his life if he stayed in Mecca.</span>
"<span>D. He was the first black man to be named a cabinet secretary" is not an accurate description of Benjamin Banneker. Banneker was an impressive and self-taught individual who corresponded with Jefferson and was fascinated with the world around him</span>
The main way in which a cataract can serve as a natural protective barrier is by reducing the amount of UV radiation that enters the eye from sunlight, which is also why it can lead to blindness, however.
gunpowder
The invention of gunpowder.
This period is also known as the medieval period and is known for the various discoveries and inventions made during this age.