For example, why one leg or arm *usually* isn’t visible larger than the other
In: Biology
Both sides follow the same inherited building plan, because all cells contain the same DNA. They don’t have much of a choice, really.
In practice, it doesn’t always work out, because of, well… that’s life, I guess. Even babies aren’t 100% symmetrical. Not to mention the possibility of one side growing stronger because of right/left handedness, occupation, injury on the other side.
So we aren’t perfectly even on both sides. I even bet one of your shoes wears and tears quicker than the other, or at least according to a different pattern. Just go to a good shoe store, they’ll tell you which one.
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