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Scientists thought the
to finding the answer was why only humans are
right-handed. Primates (monkeys and apes) use both hands
. The researchers compared human
and brain patterns with 41 species of monkeys and
. The research findings showed that humans have
legs compared to their arm length. Another reason is that the left
of the brain controls the right hand. It is also responsible for motor skills and coordination. A researcher said: "By looking across many primate
, we can begin to understand which
of handedness are ancient and shared, and which are uniquely
."
