-Well Dichotomous Key in my Biology Book says- A reference tool were a series of choices between alternative characters leads progressively to the identification of the species.
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A dichotomous key would not identify variations within a species due to environmental factors, as it relies on distinct characteristics for classification.
Yes, a dichotomous key is a tool used to help identify unknown organisms by presenting a series of paired characteristics for the user to choose from, ultimately leading to the identification of the organism.
By definition (Dichotomy; division into two parts), a dichotomous key has two choices at each step.
Dichotomous key
The dichotomous key was developed by botanist John Ray in the 17th century. Ray's work on classification and taxonomy laid the foundation for modern dichotomous keys used in the identification of organisms.