Why do we have a dominant hand?
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Hand preference probably arises as part of the developmental process that differentiates the right and left sides of the body (called right-left asymmetry). More specifically, handedness appears to be related to differences between the right and left halves (hemispheres ) of the brain.
When it comes to importance, dominance is needed for different tasks throughout the day, whether it is our writing, holding an object, cutting, and also brushing teeth. Having a consistent hand preference or an established hand dominance is important as it allows us to do tasks more efficiently and skillfully.
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