In frog the lower eye lid is

Options

A. Rapidly movable
B. slightly moves
C. immovable
D. absent

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks about the nature of the lower eyelid in frogs.

2. **Understand Frog Anatomy**: Frogs have two eyelids: an upper eyelid and a lower eyelid. The upper eyelid is thick and slightly movable.

3. **Examine the Lower Eyelid**: The lower eyelid in frogs is described as being immovable. This means it does not have the ability to move like the upper eyelid.

4. **Consider the Function of the Lower Eyelid**: The lower eyelid is considered a vestigial organ, meaning it is rudimentary and not fully developed. Its primary function is not to move but to provide some level of protection to the eye.

5. **Identify Related Structures**: Above the lower eyelid, there is a structure known as the nictitating membrane, which is often mistakenly referred to as a third eyelid. This membrane can move and serves to protect the eye.

6. **Conclusion**: Based on the information gathered, the correct answer to the question is that the lower eyelid in frogs is immovable.

### Final Answer:
The lower eyelid in frogs is **immovable**.

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