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Taxonomic keys are based on the...

Taxonomic keys are based on the

A

Morphological characters

B

Reproductive characters

C

Anatomical characters

D

Contrasting characters

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Taxonomic Keys**: Taxonomic keys are tools used in biology for the identification of organisms. They help in distinguishing between different species based on specific characteristics. 2. **Identifying the Basis of Taxonomic Keys**: The question asks what taxonomic keys are based on. The options provided include morphological characters, reproductive characters, anatomical characters, and contrasting characters. 3. **Analyzing the Options**: - **Morphological Characters**: These refer to the physical form and structure of organisms. - **Reproductive Characters**: These involve characteristics related to the reproduction of organisms. - **Anatomical Characters**: These are related to the internal structure of organisms. - **Contrasting Characters**: This refers to the differences between two or more organisms that can be used to identify them. 4. **Determining the Correct Answer**: Taxonomic keys primarily rely on contrasting characters, which allow for a clear distinction between different species. Each step in a taxonomic key presents a choice between two contrasting options (known as a couplet), leading to the identification of the organism. 5. **Conclusion**: The correct answer is that taxonomic keys are based on contrasting characters. **Final Answer**: Taxonomic keys are based on contrasting characters. ---
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