There are two factors which determine an individual’s intelligence.The first is the  sort of brain he is born with.Human brains differ considerably, some being more capable than  others.But no matter how good a brain he has to begin with, an individual will have a low order of intelligence unless he has opportunities to learn.So the second factor is what happens to  the individual——the sort of environment in which he is brought up.if an individual is  handicapped environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.The importance of environment in  determining an individual’s intelligence can be demonsdivated by the ease history of the identical twins, Peter and Mark.Being identical, the twins had identical brains at birth, and  their growth processes were the same.When the twins were three months old, their parents died, and they were placed in separate foster homes.Peter was raised by parents of low intelligence  in an isolated community with poor educational opportunities.Mark was reared in the home of  well-to-do parents who had been to college.He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually.This environmental difference continued until the twins were in their late teens, when they were given tests to measure their  intelligence.Mark’s I.Q.was 125, twenty-five points higher than the average and fully forty  points higher than his identical brother.Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level.