Answer:
William James
Step-by-step explanation:
Psychologists today who focus on the adaptive function of behaviors and emotions (that is, those who study behaviors and emotions that appear to have allowed our ancestors to survive) would likely consider William James an early representative of their approach to psychology.
William James is an American psychologist and philosopher. His writings were centered around pragmatism and functionalism. In his theory of functionalism, William James suggest that behaviour helps individuals adapt to their environment and the survival of our ancestors. He was the first psychologist and philosopher who proposed this line of thought.