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 difference between a war and a battle is similar to the difference between a book and a chapter. War usually refers to a series of battles. War is a term that applies to military conflict between two or more countries which transpire over months or years.