Gets clearer all the time. But your guy has it backwards; there were ground-dwelling mammals and transitional mammals before there were dinosaurs. And that's not news to anyone who was paying attention.
There was even one large predatory mammal that could have preyed on small dinosaurs.
Skimming the literature for talking points, I suppose one misses a lot of important information.
The atmosphere was very different. Turtles and Crocodiles survived, but they need very wet conditions.
Ice core samples provide a fascinating window into Earth's atmospheric history, revealing how conditions have changed since the time of the dinosaurs. Scientists analyze trapped air bubbles in ancient ice to study past levels of carbon dioxide, methane, and other gases, helping us understand climate shifts over millions of years.
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