Amniota, Monocondylar, Poikilothermal animals are

Options

A. Birds
B. Amphibia
C. Reptiles
D. Fish

Answer

To solve the question "Amniota, Monocondylar, Poikilothermal animals are?", we need to analyze the terms and the options provided.

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Amniota**: These are animals whose embryos develop in an amniotic sac. This group includes reptiles, birds, and mammals.
- **Monocondylar**: This refers to animals that have a single occipital condyle in their skull structure. This feature is typically found in reptiles and some other groups.
- **Poikilothermal**: This term describes animals whose internal body temperature varies with the environment. These are commonly known as cold-blooded animals.

2. **Evaluate the Options**:
- **Option 1: Birds**: Birds are amniotes and have a monocondylar skull, but they are homeothermic (warm-blooded) and can regulate their body temperature. Thus, they do not fit the poikilothermal category.
- **Option 2: Amphibia**: Amphibians are not amniotes; they have a dicondylar skull structure. Therefore, they do not fit any of the three categories.
- **Option 3: Reptiles**: Reptiles are indeed amniotes, have a monocondylar skull, and are poikilothermal (cold-blooded). This option fits all three criteria.
- **Option 4: Fish**: Fish are classified as anamniotes and do not have an amniotic sac. Therefore, they do not fit the criteria.

3. **Conclusion**: The only group that fits all three categories (Amniota, Monocondylar, Poikilothermal) is **Reptiles**. Thus, the correct answer is Option 3: Reptiles.

### Final Answer:
**Reptiles** are the amniota, monocondylar, poikilothermal animals.

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