They manipulated the length of time between seeing and recalling sets of 3-letter stimuli while preventing rehearsal.
Answer: heredity; environment
Explanation:
There is a much better appreciation now for the influence that
environment (things like nutrition, schooling, enriched stimulation, etc),can have on intelligence - intelligence can change!
(reaction range is the name of the outer limits set by heredity)
Tobacco, rice, and indigo were the southern colonies' most important cash crops. Cash crops were crops that were sold mainly for profit.
The human brain i believe