Assertion: sponge | /r/HasProperty | incurrent system
Facets:
Source sentences:
text: The essential elements of the water-current system include the pores, or ostia, through which water enters the sponge (incurrent system); the choanocytes, or collar cells, which are flagellated cells that generate water currents and capture food; and the oscula, openings through which water is expelled (excurrent system).