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.
Mesopotamia vs Egypt. Mesopotamia and Egypt are two different civilizations that show some difference between them when it comes to their history and growth. Egypt was built on both the sides of the River Nile. On the other hand, Mesopotamia was built in the fertile area between Tigris and Euphrates River. This is the main difference between Mesopotamia and Egypt. Though the location of each civilization was different, they do share something is common. Both Mesopotamia and Egypt had access to water resources. So, it is believed that both these civilizations developed on the basis of water.