Over the last hundred years there has been a great deal of discussion and research that has tried to determine the relative influence of nature and of nurture on intelligence. The consensus today is that both make a strong contribution. Find one piece of evidence showing that nature (genetics) makes a contribution and one showing the influence of nurture (environment). Try to choose evidence that has not been previously discussed by one of your classmates. Describe each of these pieces of evidence and explain why it supports the influence of either nature or nurture, as appropriate. What is the practical importance of understanding that intelligence is influenced by both factors?