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Arthropods lack...

Arthropods lack

A

Jointed appendages

B

Cilia

C

Respiratory organs

D

Segmented body.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Arthropods**: Arthropods are a diverse group of invertebrates that include insects, arachnids, myriapods, and crustaceans. They are characterized by their jointed appendages, segmented bodies, and exoskeletons. 2. **Identifying Key Features**: - **Joint Appendages**: Arthropods possess jointed appendages which are crucial for their movement and interaction with the environment. - **Segmented Body**: Their bodies are segmented, which allows for greater flexibility and mobility. - **Respiratory Organs**: They have specialized respiratory structures such as gills (in aquatic species) and book lungs (in terrestrial species). 3. **Finding the Absence**: The question asks what is lacking in Arthropods. After reviewing their characteristics, we find that they do not have cilia. Cilia are small, hair-like structures used for locomotion and are typically found in some protozoans, like paramecium. 4. **Conclusion**: Based on the characteristics of Arthropods, the correct answer to the question "Arthropods lack" is cilia. **Final Answer**: Arthropods lack cilia. ---
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