If you make something (anything) twice as big, the following happens:
– Gets 8 times as heavy.
– Gets only 4 times as physically strong
– Blood vessels need to supply blood to 8 times as much body, but are only 4 times as large
– Needs 8 times as much oxygen to live, but only has 4 times as much lung surface area.
– A whole bunch of similar stuff.
You don’t need to change the fundamental laws of nature, you just need to upgrade the materials and systems that it’s made of: stronger bones and muscles, more efficient respiration, etc. However, if you go far enough (pretty far) you will run up against the physical limits to material strength.
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