Final answer:
The functional school of psychology focuses on how mental and behavioral processes help organisms adapt and flourish, using principles from Darwin's theory of evolution by natural selection.
Step-by-step explanation:
The functional school of psychology focused on how mental and behavioral processes enable us to adapt and flourish. Figures such as William James, John Dewey, and Charles Sanders Peirce contributed to establishing functional psychology.
This approach accepted Darwin's theory of evolution by natural selection, providing the view that natural selection leads to organisms that are adapted to their environment, including their behaviors. Functionalism centered on how mental activities supported an organism's adaptation to its environment.