Describe how and why dichotomous keys are used?

Dichotomous keys are a series of paired YES or NO (binary) questions. How they are used is to analyze and ornaize species based on physical characteristics.
Why this approach is used is to provide a clear or unambiguous methodology that scientists can repeat reliably when carry out this analysis as part of their research.

Dichotomous keys are a quick way to identify unknown organisms.People only need to know about characteristics they can see to use one.The keys are based on characteristics of known organisms.The keys are a series of yes or no questions or statements about characteristics.