Assertion: sponge | /r/CapableOf | lack nervous system
Facets:
Source sentences:
text: Sponges are considered the most primitive members of the animal kingdom, since they lack a nervous system and differentiated body tissues or organs.
text: Sponges also lack symmetry, true organs, a digestive or respiratory system, a nervous system, muscles, and a true mouth.
text: Sponges are considered the most primitive members of the animal kingdom, since they lack a nervous system and differentiated body tissues or organs.
text: Sponges are very primitive animals, lacking organs and a nervous system.