11. A person’s entire environment seems to be more effectual in determining his mental ability than heredity is.
12. Experiments such as these ones prove that a person’s environment can have a crucial effect on him and on his manner of thinking.
13. A study done in Great Britain in the late 1980s shows that nutrition plays a very large role in a person’s development.
14. Starving people across the globe show why lack of nutrients in human bodies can stunt mental evolutions as well as physical growth.
15. Unique environmental factors (unique to children reared together) cause differences in behavior.
