13- chambered tubular heart is found in

Options

A. Cockroach
B. Earthworm
C. Frog
D. Rabbit

Answer

To solve the question regarding which organism has a 13-chambered tubular heart, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which organism possesses a 13-chambered tubular heart. We need to analyze the options provided: cockroach, earthworm, frog, and rabbit.

2. **Analyze the Options**:
- **Cockroach**: It is known to have a tubular heart with multiple chambers. Specifically, it has a 13-chambered heart.
- **Earthworm**: Earthworms do not have a true heart; instead, they have a series of aortic arches that function similarly to a heart.
- **Frog**: Frogs have a 3-chambered heart, consisting of two atria and one ventricle.
- **Rabbit**: Rabbits have a 4-chambered heart, which is typical of mammals.

3. **Identify the Correct Answer**: From the analysis, the cockroach is the only organism listed that has a 13-chambered tubular heart.

4. **Conclusion**: Therefore, the correct answer to the question is **cockroach**.

### Final Answer:
The 13-chambered tubular heart is found in **cockroach**.

---