Assertion: echinoderm's cell | /r/CapableOf | line sac
Facets:
Source sentences:
text: The cells lining the sacs have flagellae, which create a current of water moving in and out.
text: The cells lining the sacs have flagellae, which create a current of water moving in and out.
text: The cells lining the sacs have flagellae, which create a current of water moving in and out.