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Echinoderms are named so due to pressen...

Echinoderms are named so due to pressence of

A

Arms

B

Spines

C

Pedicellariae

D

Tube feet.

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**Step-by-Step Text Solution:** 1. **Understanding the Term Echinodermata**: The name "Echinodermata" is derived from Greek roots. The term can be broken down into two parts: "Echino" and "derma". 2. **Meaning of "Echino"**: The prefix "Echino" comes from the Greek word "echinos," which means "spine" or "hedgehog". This indicates the presence of spiny structures. 3. **Meaning of "derma"**: The suffix "derma" comes from the Greek word "derma," which translates to "skin". 4. **Combining the Meanings**: When we combine these two parts, "Echinodermata" translates to "spiny skin". This reflects the characteristic feature of echinoderms, which is their spiny or rough texture on the skin. 5. **Conclusion**: Therefore, echinoderms are named so due to the presence of spiny structures on their skin.
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