Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

n. Anything which affects the function and behavior of a living organism. Internally, this factor can be a physical, physiological, chemical, neurological, or genetic condition which causes a psychological effect. Biological factors are seen as the primary determinants of human behavior. See biological determinism.

BIOLOGICAL FACTOR: "The synthesis of of DNA, protein, and other living material in the body can be considered a biological factor."

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