Assertion: worm's system | /r/HasProperty | circulatory
Facets:
Source sentences:
text: They have a circulatory system with a heart that also functions as a kidney.[citation needed]
text: The ribbon worms are the simplest animals to possess a circulatory system and a gut with a separate mouth and anus.
text: Unlike the flatworms, however, the ribbon worms have a complete gut and a circulatory system.
text: Worms have a circulatory system with blood vessels but no heart.