Assertion: mollusk | /r/HasProperty | a few
Facets:
Source sentences:
text: Not all molluscs are beneficial to man, because some gastropods can feed on clams in their artificial offspring, there are a few that can parasitize man, there are bivalves like teredos and lithophagas that drill the wood and stone, creating a network of galleries that can weaken concrete or wooden structures, jetties of piers and hulls of boats, there are gastropods from the family of cones that can be potentially dangerous because of the active poison they possess, can kill people if they are handled carelessly, some can be toxic by ingesting them at certain times of the year.