Generally, with increase in size we get almost proportional decrease in overall speed and processes and decrease in material’s strength, decrease of thermal throuthput and other stuff. That’s caused by various factors, depending on what property we’re talking about: ratio of volume to area, gravity and other remaining the same, atoms and chemical bonds becomes smaller and has to deal with greater mass or forces.
That’s why when we measure which creature can jump more length of it’s body size – it’s always some very tiny creature. And that’s why a cat can fall from third floor without any damage and an elephant will probably tear apart and die from 2 meters fall, that’s why we don’t have really huge land animals (sea animals are supported by buoyancy, but even them can’t grow much larger than blue whale – they just can’t disperse heat of their body efficiently enough, because they would have greatly lower ratio of area to volume).
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