Which of the following phyla contains vertebrates ?

Options

A. Arthropoda
B. Chordata
C. Annelida
D. Mollusca

Explanation

To determine which of the following phyla contains vertebrates: Arthropoda, Caudata, Annelida, and Mollusca, we can follow these steps:

### Step 1: Understand the Classification of Animals
- The animal kingdom is divided into various phyla based on certain characteristics. One of the key classifications is whether an organism has a backbone (vertebrates) or not (invertebrates).

### Step 2: Identify the Phyla
- The options given are:
1. Arthropoda
2. Caudata
3. Annelida
4. Mollusca

### Step 3: Analyze Each Phylum
- **Arthropoda**: This phylum includes insects, arachnids, and crustaceans. They are invertebrates and do not have a backbone.
- **Caudata**: This is a class within the phylum Chordata that includes amphibians like salamanders and newts. Caudata does contain vertebrates.
- **Annelida**: This phylum includes segmented worms like earthworms and leeches. They are also invertebrates.
- **Mollusca**: This phylum includes snails, clams, and octopuses. They are invertebrates as well.

### Step 4: Conclusion
- From the analysis, the only phylum that contains vertebrates is **Caudata**.

### Final Answer
- The phylum that contains vertebrates is **Caudata**.

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