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.
Crustaceans and molluscs (mollusks) are two major groups of invertebrates in Kingdom Animalia with a distinct difference between them. Crustaceans are categorized under major Phylum Arthropoda, whereas Mollusc a is considered as a major phylum.ll the mollusks except cephalopods have muscular foot as the organ of locomotion. Other than for locomotion, muscular foot is also used for attachment, food capture, digging, etc. All the organs including excretory, digestive and reproductive organs are found in a visceral mass.