Answer :
Question 3 is the one that distinguishes organism X from organism Z.
A dichotomous key is a tool that allows the identification of organisms or objects based on a series of choices that lead to the correct name or identification. It is called "dichotomous" because at each step, it presents two mutually exclusive characteristics (hence, a dichotomy). Users choose the option that best matches the characteristic of the organism they are trying to identify, leading them to the next set of choices, and eventually, to the organism’s identity.
In the provided key, organism X is directly connected to question 3, whereas organism Z is reached after a series of further distinctions, following questions 3, 9, and then 10. Therefore, it's the characteristics described in question 3 that would initially separate organism X from the path leading to organism Z. Dichotomous keys are used for their simplicity and effectiveness in helping users without expert knowledge to identify species or objects. They are widely used in biological sciences and educational settings.
complete question given below:
