polar bears appear on EaRth
Scientists do not know for sure but it is believed the polar bear appeared in Earth's history as most recent as 70,000 years ago to as far as 1.5 million years ago. Many fossils have been found to range from 70,000 years old but a newer polar bear jawbone discovery is thought to be at least 100,000 years old. This discovery dates the first existence of polar bears further back than initially thought by scientists. The origin of the polar bear is an ongoing debate of scientists.