Assertion: tuatara | /r/HasAspect | penis
Facets:
Source sentences:
text: It doesn’t have a penis, and ironically, that’s made it a linchpin for understanding how penises evolved in vertebrates.
text: The tuatara has no penis.
text: The fact that the tuataras don’t have penises makes them a useful study organism because it allows scientists to ask whether the reptiles’ ancestors had penises and lost them, or never had them to begin with.