9. Identity if the organisms listed below that are members of the phylum Mollusca. \( \begin{array}{ll}\text { Chiton } \\ \text { Cone Snail } & \text { Scallop } \\ \text { Sea Slug } & \text { Sponge }\end{array} \)

1. **Chiton** - Chitons belong to the class Polyplacophora within the phylum Mollusca. - Therefore, \( \text{Chiton} \) is a mollusk. 2. **Cone Snail** - Cone snails are marine gastropods which are members of the phylum Mollusca. - Thus, \( \text{Cone Snail} \) is a mollusk. 3. **Scallop** - Scallops are bivalves, a class within the phylum Mollusca. - Hence, \( \text{Scallop} \) is a mollusk. 4. **Sea Slug** - Sea slugs are common names for various gastropods, all of which are part of the phylum Mollusca. - So, \( \text{Sea Slug} \) is a mollusk. 5. **Sponge** - Sponges belong to the phylum Porifera, not Mollusca. - Therefore, \( \text{Sponge} \) is **not** a mollusk. **Conclusion:** The organisms that are members of the phylum Mollusca are \( \text{Chiton} \), \( \text{Cone Snail} \), \( \text{Scallop} \), and \( \text{Sea Slug} \); whereas \( \text{Sponge} \) is not a member of Mollusca.