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Millions of years ago, Earth looked very different. All the continents were fused together, teeming with life, and it was both beautiful and terrifying. When you think of prehistoric times, you might imagine a T. rex tearing through the jungle with its razor-sharp teeth. But even before the dinosaurs, there were other giant creatures that ruled the Earth. What If in other places: What If in English: http://bit.ly/facebook-whatif What If in Spanish: http://bit.ly/YT-Spanish-what-if What If in Italian: http://bit.ly/Cosa-succederebbe-se What If in French: http://bit.ly/Et-si-youtube What If in Mandarin: http://bit.ly/YT-Chinese-what-if What If in Hindi: http://bit.ly/what-if-hindi-youtube Podcast: http://bit.ly/yt-what-if-show-podcast What If is a documentary miniseries that takes you on an epic journey of hypothetical worlds and possibilities. Come with us on an imaginary adventure through time, space and chance. We'll do our best to explain complex topics in a fun way. Produced with love by Underknown in Toronto: https://underknown.com