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.
A state has different defining characteristics compared to a nation. A state issues money and has a bureaucracy that provides services to its citizens. It also has recognition from other states. One of the key differences between a state and a nation is that a state has the right to enter into agreements with other states.Nations have a population that shares the same language, traditions and religion. This is not necessarily true of states.