Define Intelligence. Describe the influence of nature and nurture on intelligence: what is heritability? What do twin studies tell us about the importance of genetics on intelligence? What about how children who have been adopted and how their intelligence scores relate to their biological parents? What are some environmental influences on intelligence? Discuss where researchers believe High Intelligence comes from. Is it Nature (biological/genetic)? Is it Nurture (the environmental factors)? Is it both or somewhere in between?