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?
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Symmetry is important for locomotion, stereovision and so on. The body parts that are relevant for those features are all symmetrical. The organs inside the chest cavity and stomach don’t require full or any symmetry. A long symmetric intestinal tract is practically impossible and organs of which we only need a single one can’t all accumulate right in the center of the body, so, over time, they shifted to one of the sides where there was space for them and that’s where we have them now.
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