Scientists are predicting that 200 million years from now, the continents will collide, forming a super continent the way it did 200 million years ago when it was called Pangea. Back then it was too hot for large mammals to survive the interior, as such a huge land-force stifled ocean and atmospheric dynamics, stagnating global circulation. It was the Age of Reptiles, allowing the dinosaurs to rule the Earth. Some say it will happen again, that they'll return to their dynastic supremacy at the top of the food chain. They also say all that mammals will die off, for it will be too warm to sustain their body temperatures.
Maybe. But evolution's secret is that body temperature is flexible. As warm-blooded birds evolved from cold-blooded dinosaurs to adapt to the growing distance between continents, cold-blooded mammals may be selected to revolutionize the phylum once the continents clash again. Nature only selects those fit to serve it. The cycle will come full circle as Pangea resurrects in the far future, balancing the power struggle between mammals and reptiles that has taken place since the Permian. And mammals are really just another offshoot of reptiles, so there really isn't a struggle, just an endless experimentation of body plans.
Mammals were first, then birds. Only God knows what comes next.
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