Assertion: raven's lifespan | /r/HasProperty | the norm
Facets:
Source sentences:
text: A lifespan of 6 to 10 years is the norm since there is a mortality rate of about 50 percent in the first year.
text: A lifespan of 6 to 10 years is the norm since there is a mortality rate of about 50 percent in the first year.
text: A lifespan of 6 to 10 years is the norm since there is a mortality rate of about 50 percent in the first year.