Assertion: mass extinction | /r/UsedFor | refer to substantial increase
Facets:
value: in the degree of extinction
type: OTHER
Source sentences:
text: Mass extinction refers to a substantial increase in the degree of extinction or when the Earth loses more than three-quarters of its species in a geologically short period of time.
text: Mass extinction refers to a substantial increase in the degree of extinction or when the Earth loses more than three-quarters of its species in a geologically short period of time.