Assertion: sponge | /r/HasAspect | spicule
Facets:
Source sentences:
text: Some sponges also secrete exoskeletons that lie completely outside their organic components whilst others, e.g. Spongia officinalis, the bath sponge, have no spicules at all.
text: But most sponges have both spongin and spicules and feel rough to the touch.
text: Only sponges have spicules.