if his statement is in fact true, it substantiates some importance of heredity convincingly. It indicates that heredity certainly does have a notable effect on a person. In general, twin studies support the nature side of the debate (Morris and Maisto 82).
             Adoption studies are somewhat similar to twin studies because they are conducted for related reasons. These studies consist of monitoring and testing children who are adopted. For them, researchers study the IQs in children, their birth parents, and their adoptive parents. These studies also partially support the nurture side of the debate. Some of these studies have shown that heritabilty is about 48% influential in most humans (Hamer and Copeland 219).
             Conversely, many investigations have shown that a person's environment plays a large role in his mental aptitude. This may be the less obvious influential factor on one's life. Though, considering the enormous result of a human's surroundings and environment on his life, an in depth investigation should be taken examining this notion.
             The amount of nourishment an individual receives has been proven to play a very large part in a person's mental ability. This is especially true concerning infants and young children. The human brain critically needs nutritious food and antitoxins to function properly, particularly in early years of development. Starving people across the globe show why lack of nutrients in human bodies can stunt mental evolution as well as physical growth. "What a premature infant eats in the first month of life can have lasting intellectual impact...a new study finds" (Raloff).
             A study done in Great Britain in the late 1980s shows that nutrition plays a very large role in a person's development. Adolescents aged twelve to thirteen were given vitamin and mineral supplements for eight months. These subjects were then administered intelligence tests. Test scores were record...