More so than arthropods, chordates are related to echinoderms.
Most closely related to in phylum Chordata, which contains many complex organisms like humans, are echinoderms.Their common ancestor most likely had a cephalized nerve system that was bilaterally symmetrical and centered in the head.
Regardless of the fact that they may appear to be very different from each other, echinoderms always share two major characteristics that set them apart from all other organisms: a fluid circulatory system and five radial symmetry.
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