Which of the following is not an important reason why primatology has become increasingly important since the late 1950s? a. behavioral studies have implications for understanding natural forces that have shaped human behavior. b. many nonhuman primates are threatened or seriously endangered. c. through primatology we can better address the needs of primitive humans. d. the behavioral studies of any species provide a wealth of data on adaptation. e. nonhuman primates are our closest living relatives.