exoskeleton is absent in

Options

A. frog
B. scoliodon
C. Rabbit
D. fowl

Answer

To determine which organism does not possess an exoskeleton, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Exoskeleton**:
- An exoskeleton is a hard outer structure that provides support and protection to an organism. It is external to the body.

2. **Analyze the Options**:
- We have four options: frog, scoliodon, rabbit, and fowl.

3. **Evaluate Each Option**:
- **Frog**: Frogs are amphibians and do not have an exoskeleton. They have a soft, moist skin that serves various functions but does not provide the rigid support characteristic of an exoskeleton.
- **Scoliodon**: This is a type of shark, which has a cartilaginous skeleton but does not have an exoskeleton.
- **Rabbit**: Rabbits are mammals and have an internal skeleton (endoskeleton) but no exoskeleton.
- **Fowl**: Birds like fowl have feathers and a lightweight skeletal structure but do not possess an exoskeleton.

4. **Identify the Correct Answer**:
- Among the options, the frog is the only organism that is clearly identified as lacking an exoskeleton.

5. **Conclusion**:
- Therefore, the correct answer to the question "Exoskeleton is absent in" is **frog**.

### Final Answer:
Exoskeleton is absent in **frog**.