Assertion: echinoderm's symmetry | /r/HasProperty | adaptive
Facets:
value: for free-moving animals
type: TRANSITIVE-OBJECT
value: for radial symmetry
type: PURPOSE
Source sentences:
text: Biologists generally agree that bilateral symmetry is adaptive for free-moving animals and radial symmetry is adaptive for sedentary animals, but the echinoderms are freemoving yet exhibit radial symmetry.