Which of your textbook's unifying themes in psychology is Darwin's theory of evolution by natural selection most directly related to

A)  People's experience of the world is highly subjective. 
B)  Psychology evolves in a sociohistorical context. 
C)  Heredity and environment jointly influence behaviour. 
D)  Psychology is theoretically diverse.

Natural Selection

A process in evolutionary biology where organisms with traits better suited to their environment are more likely to survive and reproduce, influencing the traits of future generations.

Evolution

The method through which various types of organisms are believed to have evolved and branched out from their ancestral forms over the Earth's history.

Heredity and Environment

The interplay between genetic inheritance and external factors in the shaping of an individual's traits, behavior, and development.