How does a dichotomous key you identify unknown specimens based on their traits

First lets define what a dichotomous key is.

A dichotomous key is a chart of different physical traits that a species has.

It starts from basic traits and branches out into yes or no questions that make more and more detailed descriptions of the species you are trying to define.

So.. A dichotomous key helps you identify the correct species easily with a couple of yes or no questions.

Good Luck! :)

it is either c or d and i know for sure it is not a or b