Assertion: sponge's structure | /r/Synonym | nematocyst
Facets:
Source sentences:
text: Cnidocytes contain specialized structures called nematocysts, which look like miniature light bulbs with a coiled thread inside.
text: Most poisonous animals deliver their venom by biting—but not jellyfish (and other cnidarians), which have evolved specialized structures called nematocysts.