Refer to the graph showing a typical progression of an untreated HIV infection in a human.The x axis represents time, but the scale differs in different subsections. 
What is the typical length of time between point A and point B?
Definitions:
Sociable
Characteristic of enjoying companionship and being friendly.
Biological Approaches
These refer to studying psychological mechanisms and behaviors through the lens of biology, including genetics, neurochemistry, and anatomy.
Heritability Estimates
Statistical measurements that indicate how much of a trait's variation in a population is due to genetic factors.
Nature And Nurture
The interplay between genetic inheritance (nature) and environmental influences (nurture) in shaping an individual's characteristics and behavior.
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