the failure of the 2007 polar bear survival model is a simple fact that explodes the myth that polar bears are on their way to extinction.
the failure of the 2007 polar bear survival model is a simple fact that explodes the myth that polar bears are on their way to extinction.
cretaceous–paleogene extinction event:0
the cretaceous–paleogene (k–pg) extinction event, also known as the cretaceous–tertiary (k–t) extinction, was a sudden mass extinction of three-quarters of the plant and animal species on earth, approximately 66 million years ago.