Polar bears Quote by Sam Kean
““Polar bears began evolving their impressive vitamin A–fighting capabilities around 150,000 years ago, when small groups of Alaskan brown bears split off and migrated north to the ice caps.””
““Polar bears began evolving their impressive vitamin A–fighting capabilities around 150,000 years ago, when small groups of Alaskan brown bears split off and migrated north to the ice caps.””
