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A 20% reduction in gravity during the Triassic and Jurassic, caused by Earth expansion, may have played a crucial role in the origin and evolution of dinosaurs. In reduced gravity, evolutionary selection pressures would favor a relative decrease in skeletal mass, a relative decrease in bone thickness, and an increase in the uppermost size limit of land animals. These predictions are borne out ...
microlnx.com/dinosaurs/OriginOfDinosaursAndMammals.html
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