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Animals traditionally allocated to the category of organisms is currently regarded as the biological kingdom. Animals are the main object of study Zoology.
The classic signs are heterotrophy and the ability to actively move. However, there are many animals the leading fixed way of life but also peculiar heterotrophy fungi and certain parasitic plants.
Russian word animal is derived from the belly in the past. In everyday life the terms wild pets often mean only mammals or four-legged land vertebrates mammals reptiles and amphibians. However, the science behind the term animals is enshrined greater value corresponding to the Latin Animalia. In the scientific sense to addition to mammals reptiles and amphibians relates a great many other organisms fish birds insects arachnids molluscs starfish various worms.
In this earlier in this realm include many heterotrophic protists and animals were divided on subkingdoms unicellular Protozoa and multicellular Metazoa. Now called the animal in the taxonomic sense it was assigned to the multicellular. In this sense as a taxon are more definite signs they are characterized by oogamy mnogotkanevoe structure the presence of at least two germ layers stages of blastula and gastrula embryonic development. Man belongs to kingdom but traditionally studied separately. The vast majority have muscles and nerves and not having their group sponge plate Mesozoic knidosporidii perhaps lost them again.
At the same time in science animal is sometimes offered to use and in a more broad sense meaning are not a taxon and type of organization a life form based on mobility.
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