Members of which phylum are commonly known as sea walnuts or comb jellies?

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about the members of a specific phylum that are commonly known as sea walnuts or comb jellies.

2. **Determine the Correct Phylum**: The organisms referred to as sea walnuts or comb jellies belong to the phylum **Ctenophora**.

3. **Understand the Characteristics**:
- Ctenophores are characterized by having **eight rows of ciliated comb plates**. These plates are crucial for their movement, which is why they are called "comb jellies."
- They are primarily **marine organisms**, meaning they inhabit ocean waters.
- Ctenophores exhibit a **tissue level of organization** and are classified as **diploblastic**, indicating they have two germ layers.
- They display **radial symmetry**, which is a form of symmetry where body parts are arranged around a central axis.
- A notable feature of ctenophores is their ability to exhibit **bioluminescence**, allowing them to emit light.

4. **Conclude the Answer**: Based on the information gathered, the answer to the question is that members of the phylum **Ctenophora** are commonly known as sea walnuts or comb jellies.

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