The origin of animals: Animals are considered one of the basic divisions of living organisms, and they are grouped under one name called (Animalia).
They are all characterized by being multicellular and eukaryotic of different shapes and sizes. It is not possible to determine the point in time at which animals began to appear, but their appearance is estimated at least millions of years ago. It is believed that the origin of animals is multicellular mollusc organisms, and existing and extinct animals are currently classified as About a different phylum, animals that share the same characteristics are classified into specific categories. The classification of animals contains the following: Range. Kingdom. Division. Sect. Rank. Secondary rank. Family. Sex. Type.
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