Which of the following set of animals are amniotes?

Options

A. Pisces and amphibia
B. Ambhibian and reptiles
C. Reptiles, birds and mammals
D. Amphibian, reptiles and birds

Answer

To determine which set of animals are amniotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Amniotes**:
- Amniotes are a class of tetrapod vertebrates that are characterized by having an amniotic egg. This allows them to lay eggs on land or retain fertilized eggs within the mother.

2. **Identify the Classification of Vertebrates**:
- Vertebrates are classified into two main groups based on the presence of amniotic fluid:
- **Amniotes**: Includes reptiles, birds, and mammals.
- **Anamniotes**: Includes fishes and amphibians.

3. **Analyze the Options Given**:
- **Option 1**: Fishes and amphibians.
- Both are anamniotes, so this option is incorrect.
- **Option 2**: Amphibians and reptiles.
- Reptiles are amniotes, but amphibians are anamniotes, making this option incorrect.
- **Option 3**: Reptiles, birds, and mammals.
- All three belong to the class of amniotes, so this option is correct.
- **Option 4**: Amphibians, reptiles, and birds.
- While reptiles and birds are amniotes, amphibians are not, making this option incorrect.

4. **Conclusion**:
- The correct set of animals that are amniotes is **reptiles, birds, and mammals**.

### Final Answer:
The set of animals that are amniotes is **reptiles, birds, and mammals**.

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