What is the missing reagent for the following reaction? 
Definitions:
Ethical Guidelines
Set of principles designed to guide behavior and decision-making based on moral duties and virtues.
Random Sample
A method of selecting a subset of individuals from a population in such a way that every individual has an equal probability of being chosen.
Sample of Convenience
A sample of convenience is a collection of subjects or units chosen based on their easy availability and proximity to the researcher.
Demand Characteristics
Subtle cues or signals in an experimental environment that influence the participants' behavior or responses.
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