i heard it was global warming but then there weren't any people to cause so good luck with your queston.
1ooo years ago
época glacial
they were already dead
By living in caves
yes in 1500 years
Because it was'nt around then
No.
I belive iceage?
20,000 years . Or several million years.
yes, it is part of the ice age
See related link.
When IceAge 4 come out on DVD