Assertion: echinoderm | /r/SimilarTo | invertebrate groups
Facets:
Source sentences:
text: Echinoderms resemble vertebrates and some invertebrate groups (chaetognaths and hemichordates) in being deuterostomes; the hole through which the gut opens to the outside (blastopore) marks the position of the future anus; the mouth arises anew at the opposite end of the body from the blastopore.