Which of the features is not present in amphibia?

Options

A. Scales are present
B. Most of them have two pairs of limbs for locomotion
C. Eye have eyelids
D. Organisms are cold-blooded

Answer

To determine which feature is not present in amphibians, we can analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding Amphibians**:
- Amphibians belong to the class Amphibia, which is part of the phylum Chordata and the subphylum Vertebrata. They are known for their dual life, living both in water and on land.

2. **Analyzing the Options**:
- **Option 1: Scales are present**:
- Amphibians do not have scales. Instead, they have moist skin that is used for respiration. This is a key characteristic that distinguishes them from reptiles, which do have scales.
- **Option 2: Most of them have two pairs of limbs for locomotion**:
- This statement is true. Amphibians are tetrapods, meaning they have four limbs (two pairs) which they use for movement.
- **Option 3: They have eyelids**:
- This statement is also true. Many amphibians, such as frogs, have eyelids that protect their eyes.
- **Option 4: They are cold-blooded**:
- This is true as well. Amphibians are ectothermic (cold-blooded), meaning they do not maintain a constant body temperature.

3. **Conclusion**:
- The only feature that is not present in amphibians is **scales**. Therefore, the correct answer to the question is **Option 1: Scales are present**.