Connecting link between chordates and non-chordates is

Options

A. Peripatus
B. Balanoglossus
C. Sphenodon
D. Tachyglossus

Answer

To solve the question "Connecting link between chordates and non-chordates is," we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of a Connecting Link**:
- A connecting link is an organism that exhibits characteristics of two different groups. In this case, we are looking for an organism that shows traits of both chordates and non-chordates.

2. **Identify the Groups**:
- Chordates are animals that possess a notochord, dorsal nerve cord, and other specific features.
- Non-chordates are animals that do not have these characteristics.

3. **Examine the Options Given**:
- The options provided are:
- A) Peripatis
- B) Ballanoglossus
- C) Sphenodon
- D) Tacky glosses

4. **Analyze Each Option**:
- **Peripatis**: This organism is known to be a connecting link between annelids and arthropods, not between chordates and non-chordates.
- **Ballanoglossus**: This organism has characteristics of both chordates (like a notochord and dorsal nerve cord) and non-chordates (like a dorsal heart). Thus, it fits the definition of a connecting link between chordates and non-chordates.
- **Sphenodon**: This is a reptile and does not serve as a connecting link between chordates and non-chordates.
- **Tacky glosses**: Also known as echidna, this organism is a connecting link between mammals and reptiles, not between chordates and non-chordates.

5. **Conclusion**:
- Based on the analysis, the correct answer is **B) Ballanoglossus**, as it is the only organism that serves as a connecting link between chordates and non-chordates.

### Final Answer:
**B) Ballanoglossus**

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