Which one lives in burrows?

Options

A. Tubifex
B. Chaetoperis
C. Terebella
D. Both B and C

Answer

To determine which organism lives in burrows among the given options (Tubifex, Ketoperis, Terabella, both B and C), we can analyze each option step by step.

### Step 1: Analyze Tubifex
- **Description**: Tubifex worms are known to inhabit sediments of lakes and rivers and are often used as live food for fish.
- **Habitat**: They are cosmopolitan and typically found in sediments rather than burrowing into them.
- **Conclusion**: Tubifex does not primarily live in burrows.

**Hint**: Consider the habitat preferences of Tubifex and whether they indicate burrowing behavior.

### Step 2: Analyze Ketoperis
- **Description**: Ketoperis, also known as parchment worms, belong to the class Polychaeta and are segmented worms.
- **Habitat**: They are often found in shallow, silty waters, attached to solid substrates like rocks and coral. They can also be partially buried in sediments.
- **Conclusion**: Ketoperis exhibits burrowing behavior.

**Hint**: Look for organisms that are described as being partially buried or attached to substrates in a way that indicates burrowing.

### Step 3: Analyze Terabella
- **Description**: Terabella is a marine, burrowing, and sedentary annelid.
- **Habitat**: These worms grow in tubes made of sand, indicating they live in burrows.
- **Conclusion**: Terabella also exhibits burrowing behavior.

**Hint**: Identify whether the organism constructs tubes or burrows as part of its lifestyle.

### Step 4: Combine Findings
- From the analysis, we found that:
- Tubifex does not live in burrows.
- Ketoperis does exhibit burrowing behavior.
- Terabella also exhibits burrowing behavior.

Given that both Ketoperis and Terabella live in burrows, the correct answer is **both B and C**.

### Final Answer:
The organisms that live in burrows are **Ketoperis and Terabella (both B and C)**.

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