Assertion: gill | /r/CapableOf | evolve before the jawless divergence
Facets:
value: much earlier in evolutionary history
type: TEMPORAL
value: just once
type: TEMPORAL
Source sentences:
text: The researchers say this is strong evidence that gills evolved just once, much earlier in evolutionary history -- before the jawless divergence -- and that the "crown ancestor" of all vertebrates was consequently a more anatomically complex creature.