Assertion: sponge's system | /r/HasProperty | digestive
Facets:
Source sentences:
text: Sea sponges lack distinct digestive, circulatory, excretory and respiratory systems.
text: Sponges are primitive multicellular animals that have no digestive system, no circulatory system, and no nervous system.
text: Sponges also lack symmetry, true organs, a digestive or respiratory system, a nervous system, muscles, and a true mouth.
text: Sponges are primitive multi-cellular animals that have no digestive system, no circulatory system, and no nervous system.