Why does life in the sahara cluster around oases

Life in the Sahara Desert clusters around oasis because it is an area with lush, fertile land made to be so by a nearby water source.

Oases are often also important because they are a vital spot for traders and merchants to meet and refill on food, travel supplies, and water. These spots are important for military and political control of the routes to and from the oases.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.