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" ... 310 million years ago, there was an important evolutionary split between the sauropsids, which would become the modern reptiles, dinosaurs, and birds, and the synapsids, which were reptiles with distinctive jaws. These latter reptiles would eventually evolve into all the mammals ever to populate Earth. Dimetrodon-like animals and their close cousins, the therapsids (which arose 275 million years ago), are the dominant synapsid land animals at this time. ... "