Add. Write the answer as a fraction in lowest terms or as an integer. 
Definitions:
Heritable
Referring to traits or characteristics that can be passed from parents to their offspring through genes.
Sensation Seeking
A personality trait defined by the search for experiences and feelings that are varied, novel, complex, and intense, and by the readiness to take physical, social, legal, and financial risks for the sake of such experiences.
Genetic Expression
The process by which information from a gene is used to direct the synthesis of proteins or to produce a functional gene product, influencing an organism's characteristics.
Social Environment
The immediate physical and social setting in which people live or in which something happens or develops. It includes the culture that the individual was educated or lives in, and the people and institutions with whom they interact.
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