Ctenophores differ from cnidarians by the presence of

Options

A. choanocytes
B. enidocytes
C. comb plates
D. tentacles

Answer

To answer the question "Ctenophores differ from cnidarians by the presence of," we will analyze the characteristics of both groups and identify the unique feature of ctenophores.

### Step-by-Step Solution:

1. **Identify the Groups**:
- Ctenophores (also known as comb jellies) and cnidarians (which include jellyfish, corals, and sea anemones) are both part of the animal kingdom but belong to different phyla.

2. **Understand Key Features**:
- Cnidarians are characterized by the presence of **cnidocytes**, specialized cells that contain stinging structures called nematocysts, which are used for capturing prey.
- Ctenophores, on the other hand, do not have cnidocytes. Instead, they possess **combs** or **ctenes**, which are rows of ciliated plates used for locomotion.

3. **Highlight Unique Features**:
- The unique feature that distinguishes ctenophores from cnidarians is the presence of **combs (ctenes)**. These structures allow ctenophores to move through the water by beating the cilia.

4. **Conclusion**:
- Therefore, the correct answer to the question is that ctenophores differ from cnidarians by the presence of **combs (ctenes)**.

### Final Answer:
Ctenophores differ from cnidarians by the presence of **combs (ctenes)**.

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