Assertion: opossum's adaptation | /r/CapableOf | arise as a defense mechanism
Facets:
value: originally
type: MANNER
Source sentences:
text: Some authors have suggested that this adaptation originally arose as a defense mechanism, allowing a rare reversal of an evolutionary arms race where the former prey has become the predator, whereas others have suggested it arose as a predatory adaptation given that it also occurs in other predatory mammals and does not occur in opossums that do not regularly eat other vertebrates.