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I think Dinosaurs were killed off because the gravity of the Earth increased and their mass could not cope with the increase.Maybe from meteorite bombardments and not just one sudden meteorite hit as they didn't die off quickly.Everything in the dinosaur age was much larger than now, giant plants and ferns and also giant dinosaurs, to me that suggests less gravity. With an increase in gravity the large body mass of the dinosaurs would be under great stress as height would depend on body mass and gravity. Less gravity would have made it easier for a large mass to move and for some of the large gliding dinosaurs, easier to fly/glide.Increase the gravity on an Elephant and you would find it would not be able to move much or last long."B"
I find it hard to believe that in over 230 million years the earth's gravity has not changed or had an impact on organic growth.A mature t-Rex at around 25ft tall (a small dinosaur) and weighing in at around 5 tons had hollow thigh bones, any running or jumping would have been bio mechanically impossible. At that size and weigh the bones would snap! They didn't snap so there is something else going on.