Assertion: python | /r/HasProperty | primitive snakes
Facets:
Source sentences:
text: Pythons are primitive snakes that have vestigial or leftover pelvic girdles and hind limbs that show up externally as a pair of "spurs" near the base of the tail.
text: Pythons are considered a primitive snake differing from many other species by having two functioning lungs and vestigial, or left over, hind limbs.