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The most ancient group of animals, they live underwater, lack real tissues and body symmetry.



sponge, parazoan, collar cell, pore cell, sclerocyte, gastric cavity, pore, migratory cells, filter-feeding lifestyle, calcareous sponge, siliceous sponge, demosponge, animal, biology

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Tardigrades can survive in extreme environments, they can even stay alive in outer space.


The ancestors of Arachnida and Crustacea belonged to the class Trilobita.

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