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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Earth’s gravity was not as strong millions of years ago. If those big dinosaurs lived today, they would be crushed by their own weight. As the universe continues to expand , stretching the fabric of space, the forces applied to any object deforming that fabric ( like a planet ) increase.
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