Simplify each term, if necessary, and then use the distributive property to combine terms, if possible. 
Definitions:
Case Study
A case study is a research method that involves an in-depth investigation of a single case or instance, often used in psychology, sociology, and other social sciences.
Physiological Changes
Alterations in the body's normal biological function or structure that occur as a result of aging, disease, or environmental factors.
Naturalistic Observation Method
An investigative technique where individuals are watched in their natural surroundings without interference from the investigator.
Experimental Method
A research method involving the manipulation of variables to test hypotheses and determine cause-and-effect relationships in a controlled environment.
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