Dinosaurs seemed to have generally been so much larger than animals today. Huge dragonflies that dwarf their modern counterparts, turtles 10ft long. What is the mechanism that allowed them to be so large, or conversely makes modern ones smaller? Is it about Oxygen levels, or efficiency, or something else?
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Dinosaurs also existed for around 165 million years. In contrasts mammals have been round 65 millions years. There was a lot more time for evolution and natural selection to work out what worked best for their survival and reproduction. So in those extra 100 million years bigger was better.
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