Refer to the graph showing the demand for books. The quantity demanded when price is $16.00 is: 
Definitions:
Genetic Susceptibility
The increased likelihood of developing a particular disease based on a person's genetic makeup.
Motor Development
Refers to the progression of muscle coordination, strength, and the ability to move and control physical actions.
Social Environment
The immediate physical and social setting in which people live or in which something happens or develops.
Kohlberg's
Pertains to Lawrence Kohlberg's theory of moral development, which proposes that moral reasoning develops in stages throughout a person's life.
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