The primitive characters of Duck billed platypus suggest that it :-

Options

A. Is a degenerated mammals
B. Shows the stage between aves and mammals
C. Shows the stage between reptiles and birds
D. Shows the stage between reptiles and mammals

Answer

To solve the question regarding the primitive characters of the Duck-billed Platypus, we will analyze each option provided and determine which one accurately reflects its evolutionary significance.

### Step-by-Step Solution:

1. **Understanding the Duck-billed Platypus**:
The Duck-billed Platypus (Ornithorhynchus anatinus) is a unique mammal known for its distinct features, including a duck-like bill, webbed feet, and laying eggs.

2. **Evaluating the Options**:
- **Option 1: Degenerated mammal**: This option suggests that the platypus is a less evolved mammal. This is incorrect as the platypus is not a degenerated form but rather a unique evolutionary branch.
- **Option 2: Shows the state between the apes and the mammals**: This option implies that the platypus is a link between apes and mammals. This is incorrect because Archaeopteryx is known as the connecting link between reptiles and birds, not between apes and mammals.
- **Option 3: Shows the state between the reptiles and birds**: This option is also incorrect. Archaeopteryx serves as the connecting link between reptiles and birds, not the platypus.
- **Option 4: Shows the state between the reptiles and the mammals**: This option is correct. The platypus exhibits primitive characteristics that suggest it shares traits with both reptiles (like laying eggs) and mammals (like having fur and producing milk).

3. **Conclusion**:
Based on the analysis, the correct answer is **Option 4**, as the Duck-billed Platypus represents a transitional form between reptiles and mammals.