Assertion: extinction's cause | /r/HasProperty | disease
Facets:
Source sentences:
text: Proposed causes include disease, heat waves and resulting sterility, freezing cold spells, the rise of egg-eating mammals, and X-rays from a nearby exploding supernova.
text: Natural causes for extinction include the following: asteroids, acid rain, volcanic eruptions, earthquakes, climatic heating or cooling, changes in sea level or currents, cosmic radiation, predation and disease, and spread of invasive species.