Assertion: bowfin's tail | /r/CapableOf | remain ineffective
Facets:
value: relatively
type: DEGREE
Source sentences:
text: In some fishes with a diphycercal tail (with the axis of the vertebrae extending down the middle of the fin lobe), developed in both modern and ancient fishes, the tail remains relatively ineffective because it has remained too rigid for proper propulsive action.