Answer:
The terrain of the dessert was extremely harsh, and it was necessary to join other groups in order to survive.
Step-by-step explanation:
With a territorial extension of 2,149,690 square kilometers, Saudi Arabia has a hot arid climate in most of the territory, except for the north, where the subtropical climate predominates. The very hot and arid climate comes with a desert region that is difficult to handle. The inhospitable environment imposes many challenges on the inhabitants, interfering with their life forms. Due to the difficult geography it became necessary for individuals to get together in groups to survive.