Assertion: plesiosaur's flipper | /r/HasProperty | powered by strong muscles
Facets:
Source sentences:
text: Their limbs had evolved into four long flippers, which were powered by strong muscles attached to wide bony plates formed by the shoulder girdle and the pelvis.
text: Their limbs had evolved into four long flippers, which were powered by strong muscles attached to wide bony plates formed by the shoulder girdle and the pelvis.