The Sahara desert is important for a multiple of reasons. One is that although it is a desert, there are many fertile areas of land making it great for farming and supporting life. It also acts as a natural barrier in between north and south Africa, which was able to impact trade with the South, slowing down innovation on both sides.
The most resent one i would say floods!! because they have nearly dubbled since 1900!!
I think it's B but I'm not to sure. hope that at least kinda helps.
