Assertion: sponge's predator | /r/HasProperty | rare
Facets:
Source sentences:
text: The fragile glass sponges, with "scaffolding" of silica spicules, are restricted to polar regions and the ocean depths where predators are rare.
text: Glass sponges produce no toxic chemicals, and live in very deep water where predators are rare.
text: Glass sponges do not produce any toxins, but they live in the very deep ocean where predators are rare.