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Animals are multicellular eukaryotic organisms that form the kingdom Animalia. Over 1.5 million animal species have been described, though it is estimated there are over 7 million total. Animals range greatly in size and have complex interactions within ecosystems. Most living animal species have a bilaterally symmetric body plan and are divided into protostomes and deuterostomes. Early life forms interpreted as animals were present in the late Precambrian, with many modern phyla emerging in the Cambrian ex

Author

Ana-Maria

Language

EN