What was the rule of succession to the office of caliph during the abbasid?

How is the president involved in the process of bills becoming laws?

Iwill arward ! , i if po≅ pr, uo≅ ur, prove: ∠o ≅ ∠r. fill in the blanks: draw segment ≅ uo ≅ po≅ △oup ≅ △

Which of the following does not describe europe after that fall of the western roman empireh