When Bayley retested a group of representative adults who had been tested as children, she found that intelligence was still improving at age 36

A researcher took children into her lab and offered them as many high-sugar snacks as they wanted. She then recorded their activity level using various observational and physiological measures. She found that on all measures, high sugar intake was associated with high activity level. Which would be the best conclusion to reach from this data?

a. the sugar caused the high activity b. there is a negative correlation between sugar consumption and activity level c. there is a positive correlation between sugar consumption and activity level d. children with higher metabolisms tend to eat more sugar and have higher activity levels

The reaction-range model is best described as a(n) _______ account of individual differences in intelligence

a) genetic b) social c) environmental d) interactionist