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.
Characteristics of the Kingdom Plantae What makes plants unique from the other kingdoms, and how can moss and a fir tree be in the same kingdom? Kingdoms are grouped based on shared characteristics, and plants have quite a few.