Why were oases important for living in a town

Oases provided water for the towns prople, the animals, and for the crops.

Oases also provide habitat for animals and even humans if the area is big enough. The location of oases has been of critical importance for trade and transportation routes in desert areas; caravans must travel via oases so that supplies of water and food can be replenished.

What the question i don't get it do u mean what she needs to do to auctually become one