Which of the following are Anamniotes ?

Options

A. Chondrichthyes, Ostiechthyes , Amphibia
B. Reptilia, Aves, Amphibia
C. Amphibia, Aves, Mammals
D. Reptilia , Mammals , Aves

Answer

To determine which of the following are anamniotes, we need to first understand the definitions and classifications involved in this question.

### Step-by-Step Solution:

1. **Define Amniotes and Anamniotes**:
- Amniotes are vertebrates that have an amnion, which is an extra embryonic membrane that surrounds the embryo. This includes reptiles, birds (aves), and mammals.
- Anamniotes are vertebrates that do not have an amnion. This group includes fish (Pisces) and amphibians.

2. **Identify the Groups**:
- The question asks which of the following groups are anamniotes. The groups mentioned are likely to include Chondrichthyes (cartilaginous fish), Osteichthyes (bony fish), and Amphibia (amphibians).

3. **Classify Each Group**:
- **Chondrichthyes**: This class includes sharks and rays. They do not have an amnion, so they are anamniotes.
- **Osteichthyes**: This class includes bony fish. They also do not have an amnion, making them anamniotes.
- **Amphibia**: This class includes frogs, toads, and salamanders. They also lack an amnion, so they are anamniotes.

4. **Conclusion**:
- Since all three groups (Chondrichthyes, Osteichthyes, and Amphibia) do not possess an amnion, they are all classified as anamniotes.

### Final Answer:
The anamniotes among the options provided are **Chondrichthyes, Osteichthyes, and Amphibia**.

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