Question 

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