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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Hollow structure bones, strong and light weight. A lot of mass was able to be piled onto this structure. All that muscle mass generates enormous heat, which leads to…
Circular breathing. In the mouth and out the nose. The air passage ran throughout their bodies, past each organ allowing it to keep cool and grow more.
Abundant food source.
Eggs for reproduction, as opposed to birthing. This takes a huge energy requirement of off the mothers.
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