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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Humans killed them. They were threats. The invention of the spear and throwing basically kills any large animal, along with digging pits.
Even if a predator manages to kill human hunters, it won’t get away uninjured, and eventually those injuries will cause complications.
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