How did camels increase trade across geographic barriers of northern africa

The way that camels help increase trade across geographic barriers of northern Africa is : Camels helped with transportation.
Back then, we still have not developed machine based transportation vehicles, so we rely on ships and carts. Since the horses are unable to cross pass the desert, most of the animals that is used on northern Africa trade were camels.

February 1848 is when it was added. if that's what you were asking