Answer :
The right option is; D.yes-or-no questions about easily observable characteristics.
A dichotomous key is a tool designed by scientists to help its users to identify a particular type of object and organisms based on physical characteristics. A dichotomous key is divided into two sections and it usually contains specific questions with two choices (yes or no) in each step. When a question is answered, the key guides the user to the next question to ask until the user is able to correctly identify the name of the unknown organism.
Dichotomous keys ask yes-or-no questions about easily observable characteristics.
In biological taxonomy, dichotomous are key tools used to classify organisms based on a series of choices between two different characters. Generally, one can quickly look at these properties and answer the question with a straight "yes" or "no".
The user can identify the creature being classified by gradually narrowing down the options through a sequence of yes-or-no questions. Rather than using judgmental or open-ended questions, this method enables rapid and systematic identification of organisms based on their observable characteristics.
So, the correct option is D.
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