Assertion: pit viper's venom | /r/HasProperty | dual-purpose
Facets:
Source sentences:
text: Proteolytic venom is also dual-purpose: first, it is used for defense and to immobilize prey, as with neurotoxic venoms; secondly, many of the venom's enzymes have a digestive function, breaking down molecules in prey items, such as lipids, nucleic acids, and proteins.