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Invertebrate Nervous System

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AB
poriferanone
cnideranerve net
platyhelminthescephalized, ladderlike system
nematodaganglia and nerve rings
molluscavarious; highly developed cephalopods
annelidanerve cord connecting brain with ganglia
arthropodaspecialized sensory organs
echinodermatanerve ring but no brain or head

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