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Around 90 per cent of people [worldly / worldwide] are right-handed. Scientists have spent decades [trying / tried] to find out why. Researchers from Oxford University in the UK believe they have a [possibly / possible] answer. Their research suggests that the answer is because of two features of human [revolution / evolution] . The first is walking [in / on] two legs, and the other is the large size of the human brain. When humans first started walking on two legs, their [hand / hands] were free to do things. Our large brain worked [out / in] many things to do with our hands like using tools. If [most / much] people used the same hand, using tools and working with others [become / became] easier. This became useful for things like hunting and [cook / cooking] .

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