Which school of psychology would agree with the statement that "psychology should stress the study of how behavior and mental processes function to allow people and animals to adapt to their environments"?

Functionalism.

Explanation:

Functionalism is a type of theory or a type of school of psychology that mainly focus on human consciousness and there way of adaptation. This method is relevant for the consciousness study.

Functionalism agrees that the psychology focus on the study of mental and behavior process. This functionalism helps the organism to adapt better to their environment.

Thus, the answer is functionalism.

did you fail the test? xd

not sure if this is what you'r looking for eubacteria and archaebacteria