There is no evidence that any aliens exist so it is impossible to say how they may cause extinction.
If you are on about Aliends Versus Predator : Extincation then yes.
From the PALEOZOIC ERA.
aliens are experinced cause they are in rusty romans head and dibobical dion head
aliens.
ALIENS!
Cause in the movies they saw aliens destroying the Earth and eating people and stuff.
are you serious ?? cause if you are your one daft person
If you are abducted by aliens dont move cause they dont know what you are yet then try run away from them slowly
aliens are supposed have one brain like humans but we really never know cause most of us have never aliens before so its up to you to decide what you think
It doesn't matter whether they're illegal aliens: you can evict anyone you want to for good cause.
cause we pissed them off
Aliens, as in space aliens? No. "Aliens" as in non-American human beings who shouldn't have been allowed into the United States? Yes. Some of them were, in fact, "illegal aliens" from Egypt. Several of them had been allowed into the USA, but had overstayed their visas, and should have been arrested and deported.