It's hard to know the exact sequence of events that allowed neanderthals or denisivens, to become distinctive enough. They are classified as new species because they could mate with homosapiansno,. In that sense, you might think, well, maybe they're all just one big species or their sub species. It kind of gets down to semantics. But when it comes down to a neanderthal, let's say, their skeletons, their bodies, their physique, was different enough from homo sapians. And so it's because they're both anatomically and genetically quite distinctive that they are called different species. That breeding wouldn't always be successful
In times of turmoil, it can be useful to take a longer view of history. Like, a LOT longer. Paleontologist and author of “The Rise and Reign of the Mammals” Stephen Brusatte joins Adam to explain how mammals took over the Earth hundreds of millions of years ago, and why we survived and achieve sentience when dinosaurs died out. Stephen goes on to discuss why taking a deep look at our history can help prepare us for the crises of the near future. You can purchase Stephen’s book at http://factuallypod.com/books
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