Based on the key you used for the sharks, list 2 features a dichotomous key must have to classify organisms.
To answer your question, I first need to explain what a dichotomous key is. A dichotomous key is a tool used to identify and classify organisms based on their characteristics. It consists of a series of paired statements or questions, where you choose the statement that best describes the organism you are trying to classify. By selecting the appropriate statements at each step, you can eventually determine the identity of the organism.
Now, when creating a dichotomous key or evaluating an existing one, there are two important features it should have to effectively classify organisms:
1. Clear and mutually exclusive choices: Each step of the dichotomous key should present two mutually exclusive options. This means that the choices should be distinct from each other, with no overlap or confusion. By having clear and unambiguous choices, it becomes easier to differentiate between different organisms and make accurate identifications.
2. Progressive and organized structure: A dichotomous key should follow a logical and progressive structure. The choices presented at each step should lead to a more specific characteristic or trait that helps to differentiate between different organisms. The key should guide the user through a series of increasingly specific questions or statements, resulting in the successful classification of the organism.
By providing clear and mutually exclusive choices along with a progressive and organized structure, a dichotomous key becomes a valuable tool for classifying organisms accurately and efficiently.