How do the right hand and the left hand operate separately and in unison? And look to be a mirror image of each other?
Things operate separately and in unison because we have a brain that handles that. As we can see when people have strokes, damage the brain, damage the brain, damage the separately and in unison. As for looks, symmetry works better in nature most of the time. Notice there’s very few species that are unsymmetrical (flounders), it gives better access to all 360 degrees of the world around us if we have basically the same parts on both sides.