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drafterman t1_iy4dgmy wrote

Because it evolved to do so. All life has evolved on this planet under these conditions so as organisms got larger and more complex, that came with it the necessary internal and external structures to survive in the conditions of its environment.

Don't forget that life came from the sea where the pressure is even greater.

And also don't forget that we aren't sealed tight. We establish an equilibrium with our environment.

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