The origin of animals Animals are among the basic divisions of living organisms, and they are grouped under one name called (Animalia).
They are all characterized by being multicellular and eukaryotes of different shapes and sizes, and it is not possible to determine the time point at which the animals appeared, but their appearance is estimated at no less than millions of years, and it is believed that the origin of the animals is multicellular mollusks, and the existing and extinct animals are currently classified within About different phyla classify animals that share the same traits into specific classes, and the classification of animals includes the following: Scope. The kingdom. Division. sect. Rank. secondary rank. the family. sex. Type.

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