Assertion: turtle | /r/HasAspect | two groups
Facets:
Source sentences:
text: Turtles are divided into two groups, according to how they retract their necks into their shells (something the ancestral Proganochelys could not do).
text: Turtles are divided into two groups according to how they retract their necks into their shells.
text: Turtles are divided into two groups, according to how they evolved a solution to the problem of withdrawing their necks into their shells.