Which of the following best describes a dichotomous key?

• A. A tool that uses a series of paired statements to identify organisms based on their characteristics.
• B. A list of all known species within a particular taxonomic group.
• C. A chart that shows the evolutionary relationships among different species.
• D. A method for classifying organisms based on their genetic sequences.

Answer: (A)

Verified step by step guidance

1. Understand the concept of a dichotomous key: It is a tool used in biology to identify organisms based on their physical or observable characteristics. The key works by presenting a series of paired statements or questions, each describing contrasting features of organisms.
2. Recognize the purpose of a dichotomous key: It helps in narrowing down the identification of an organism by systematically eliminating options based on the organism's traits.
3. Compare the given options: Analyze each choice to determine which one aligns with the definition and purpose of a dichotomous key.
4. Option analysis: The first option describes a tool that uses paired statements to identify organisms based on their characteristics, which matches the definition of a dichotomous key. The other options describe different tools or methods, such as taxonomic lists, evolutionary charts, or genetic classification methods, which are not dichotomous keys.
5. Conclude that the correct description of a dichotomous key is the first option: 'A tool that uses a series of paired statements to identify organisms based on their characteristics.'