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Politics : Politics for Pros- moderated -- Ignore unavailable to you. Want to Upgrade?

To: Nadine Carroll who wrote (247269)	4/24/2008 8:32:46 PM
From: Snowshoe	Read Replies (1) \| Respond to of 793896

>>I think the polar bears will be okay regardless. They've been around for millions of years, which means they have survived many ice ages and interglacials.<< The polar bear (Ursus maritimus) is actually a very recently evolved species... >>According to both fossil and DNA evidence, the polar bear diverged from the brown bear, Ursus arctos, roughly 200 thousand years ago. The oldest known polar bear fossil is less than 100 thousand years old. Fossils show that between 10 and 20 thousand years ago, the polar bear's molar teeth changed significantly from those of the brown bear. Polar bears are thought to have diverged from a population of brown bears that became isolated during a period of glaciation in the Pleistocene.[13]<< en.wikipedia.org