Question 1 Scientists distinguish between ______, which are their systematic observations, and theories, which are their explanations or interpretations of phenomena. A. explanations B. phenomena C. interpretations D. scientific theories Question 2 Researchers generally consider multiple ______ for any set of phenomena. A. questions B. theories C. reasons D. hypotheses Question 3 ______ which specify a series of stages that people pass through as they develop or adapt to their environment. A. Theoretical approach B. Functional theories C. Mechanistic theories