Jellyfish
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Bilateria
Sponge
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Nemertea
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Placozoa
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Chaetognatha
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Echinoderm
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Cloudinidae
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Vertebrate
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Peripheral nervous system
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Flatworm
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Nervous system
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Hydra (genus)
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Geologic time scale
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Timeline of life
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Ediacaran
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Central nervous system
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Cnidaria
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Cambrian
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Chordate
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Cell (biology)
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Brain
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Bryozoa
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Maotianshan Shales
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Mitochondrial DNA
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Coelom
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Gastrointestinal tract
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Sea urchin
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Ctenophora
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Homeobox
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Evolutionary developmental biology
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Symmetry
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Kingdom (taxonomy)
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