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Which phyla have well developed nervous system

2 Answers

5 votes
Nematodes

Nematodes (phylum Aschelminthes) have a high degree of centralization, with three-quarters of all nerve cells concentrated in a group of anteriorly placed ganglia and no peripheral plexuses or nets.
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User Rapptz
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5 votes

Answer:

Cnidarians.......hope it helps

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User Shoosh
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