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Twins studies are normally conducted to further support or reject biological influences on a life forms (not just human) development in many areas, some of which are: mental illness, intelligence and behaviour.

If a concordance rate is higher on a twin study when compared to a non-twin study, the results can suggest that there is a biological link in the area they are researching. This is due to twins sharing the same genes so it is assumed that if one twin is intelligent or suffers from a mental illness, the other twin would have it too as they share the same DNA.

Although research (not only on twins, but family relations of any possible kind that is biological) has suggested that there is a biological link in many areas, the concordance rates are never 100%, therefore environmental explanations are often used to accompany biological explanations.

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