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Phylum ctenphora...

Phylum ctenphora

A

Crustacea and arachnida

B

polychaeta and hirudinea

C

tentaculata and nuda

D

calcarea and demospongiae

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### Step-by-Step Solution for Phylum Ctenophora 1. **Definition of Phylum Ctenophora**: - Ctenophora, commonly known as comb jellies, is a phylum of marine invertebrates characterized by their unique locomotion using cilia. 2. **Classes of Ctenophora**: - There are two main classes within the phylum Ctenophora: - **Tentaculata**: This class includes organisms that possess large, visible tentacles. They also have specialized structures known as comb plates, which are used for locomotion. - **Nuda**: This class includes organisms that do not have tentacles. 3. **Examples of Ctenophora**: - Common examples include species like *Beroe*, which is a type of comb jelly. 4. **Distinction from Other Phyla**: - It's important to distinguish Ctenophora from other phyla: - Classes like Crustacea and Arachnida belong to Phylum Arthropoda. - Classes such as Polychaeta and Hirudinia belong to Phylum Annelida. - Calcarea and Demospongia are classes under Phylum Porifera. 5. **Conclusion**: - The correct classification for the classes of Phylum Ctenophora is Tentaculata and Nuda.
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