īack in episode 49, I mentioned the Great American Interchange, which took place three million years ago when North America and South America collided and were connected by the isthmus of Panama. 8) Author unknown, WWF (date unknown), Top 10 facts about polar bears (online). 7) Author unknown, Understanding Evolution (), (date unknown), Misconceptions about evolution (online). 6) Author unknown, BBC Newsround (2021), Have you ever heard of a ‘pizzly’ bear? (online). 5) Wei-Haas, M., National Geographic (2018), Ancient Girl’s Parents Were Two Different Human Species (online). (2008), The Encyclopedia of Animals: A Complete Visual Guide (p.370). 4) Cooke, F., Dingle, H., Hutchinson, S., McKay, G., Schodde, R., Tait, N. (2018), Biology: a global approach, 11th edition (Global Edition), Harlow, Pearson Education Limited. 2) Callaway, E., New Scientist (2010), Neanderthal genome reveals interbreeding with humans (online). Sunderland, Massachusetts, Sinauer Associated Ltd. Its existence- and that of cases like it- also allow us to put something called the biological species concept under scrutiny… As the name might suggest, this refers to the offspring of a grizzly bear and a polar bear. We’re going to explore a particular kind of hybridisation today- the kind that produces grolar bears.
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