What caused islam to split into the sunni and shia branches?

some women in the middle and upper classes worked as doctors, government officials, or priestesses. both women and men enjoyed a better quality of life the higher they were on the social pyramid. the egyptians believed that their class system created a stable, well-ordered society. each group had its own role to play.

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!