Assertion: spider's pair | /r/HasProperty | derived
Facets:
value: sometimes
type: TEMPORAL
value: better
type: DEGREE
Source sentences:
text: The other pairs, called secondary eyes, are thought to be derived from the compound eyes of the ancestral chelicerates, but no longer have the separate facets typical of compound eyes.
text: Sometimes one pair of eyes is better developed than the rest, or even, in some cave species, there are no eyes at all.