Dichotomous key use observable characteristics. thus option D is correct.
What is a dichotomous key?
A dichotomous key is a tool that can be used to identify organisms or objects in the natural world, such as plants, animals, or rocks.
The key consists of a series of paired statements or clues about features or characteristics, providing a stepwise guide toward identifying each entity.A dichotomous key is an important scientific tool, used to identify different organisms, based the organism's observable traits. Dichotomous keys consist of a series of statements with two choices in each step that will lead users to the correct identification.
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