Why is the human body is symmetrical in exterior, but inside the stomach and heart is on left side? what advantages does it give to us?
In: 6507
External symmetry allowed our aquatic ancestors to become streamlined for speed [1672, 1871, 2766], and it has been retained ever since because it is just as useful for walking as it was for swimming [517]. In contrast, the only locomotory restriction on our internal organs has been that their weight be distributed evenly relative to the midline.
If we trace the history of our anatomy back before the fish stage of evolution, we find that the inside of the body used to be as symmetric as the outside [512, 1462].
[source](https://www.cambridge.org/core/books/abs/quirks-of-human-anatomy/symmetry-and-asymmetry/6B91C73DA77BC52744BD18F486A651E1)
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