Assertion: koala's history | /r/CapableOf | drive older species
Facets:
value: to extinction
type: TRANSITIVE-OBJECT
Source sentences:
text: Another theory for the decline might be, as research shows, that species from the Southern Hemisphere are on average 4.6 million years old, compared to an average 2.9 million years old for the Northern Hemisphere: Researchers believe this age difference is because of the history of severe ice ages in the Northern Hemisphere, which may drive older species to extinction.