12716287, bilateral symmetry in biology was an adaptation to directional movement
Posted by cgonz00cc, Mon Feb-02-15 04:26 PM
Lower evolutionary life is symmetrical radially, like a starfish
But when an organism moves in one direction relative to its body ie forward, sensory organs need to be on the end that encounters the environment first, and the structures that allow for locomotion need to be balanced on both sides of the sagittal plane. Basically you have 2 legs so that you dont walk in circles.
2 eyes are necessary for stereoscopic vision, and 2 ears are necessary for balanced audio levels in the brain.
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