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Dimetrodon was actually not a dinosaur; it was a prehistoric reptile that existed before the dinosaurs. The sail on their back was likely used for thermoregulation; it could be used to catch heat from the sun to warm the animal. It may have also been used as a display to communicate, make it appear larger, or attract mates.
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Earn +20 ptsQ: What is the fin on the dinosaur dimetrodon there for?
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