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The two bones in the forearm allow it to turn better, so it is not necessary to turn the whole arm in oreder to slightly change the angle of the hand. There are three bones in the human arm (radius, ulna, humerus), so the question needs to be revised.
If the question was supposed to be why having two bones in the FOREARM is better than one, then the answer is because having two bones is what allows the forearm to rotate. If there were only one bone in the forearm, then we would not be able to do so.
What else can I help you with?
Does the arm have more bones than the leg?
No.
Does the human arm have more bones than the human leg?
No.
How many bones are in each arm?
the arm has three bones.
How are the biceps and the bones of the arm related?
The muscles attach to the bones of the arm
Does your arm have 3 short bones?
No. The 3 main bones of the arm - namely, the humerus, ulna and radius - are all long bones.
Do your arm bones cross when you fold your arms?
No, your arm bones do not cross when you fold your arms.
Are there humans with more than 206 bones?
Yes. My older sister broke her arm when she was about 2 (i think? i wasn't born until she was 7). Her arm was broken in 6 places and never healed to become a normal human arm, so she now has 6 extra bones totaling 212 bones. I heard about this story recently and i have also become interested in humans with more than the average amount of bones, but i can't find any results.
What bones do baseball help?
Leg bones and arm bones
What is the job of the arm and leg bones?
The arm and leg bones keep your arms and legs straight
How many bones are in your lower arm?
The bones in the lower arm are the RADIUS and the ULNA.
Do your bones cross when you turn your arm?
No, bones do not cross when you turn your arm. The bones in your arm, the humerus, radius, and ulna, rotate around each other at the elbow joint to allow for movement.
How many bones in your arm?
Three bones in your arms
