The Abbasid Caliphate differed from others in that it did not have the same borders and extent as Islam. Particularly, in the west of the Caliphate, there were multiple smaller caliphates that existed in relative peace with them.
The major difference between the protist and the animal kingdom is protists are unicellular protozoans and unicellular & multicellular, but animals are multicellular animals.
The two countriesâ political systems are especially different in the constitution, the legislature, the executive, and the judicial. Perhaps the most fundamental difference between the American and British political systems is the constitution--or the lack of one.