Assertion: mollusk | /r/CapableOf | evolve ornament
Facets:
value: to ward of predators
type: PURPOSE
Source sentences:
text: Geerat Vermeij, professor of paleoecology at UC Davis and author of A Natural History of Shells, believes that mollusks in the tropics evolved these ornaments to ward of predators—a much better option than creating a big, thick shell, which will keep predators at bay but is also a pain to make and drag around.