A living connective link which provides evidence for organic evolution

Options

A. Archeopterys between reptiles and mammals.
B. Lund fish between pisces and reptiles
C. Duck bill Platypus between reptiles and mammals.
D. Sphenondon between reptiles and birds.

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks for a living connective link that provides evidence for organic evolution. This means we need to identify an organism that shows characteristics of two different groups and is still alive today.

2. **Reviewing the Options**: The options given are:
- A) Archaeopteris between reptiles and mammals
- B) Lungfish between Pisces and reptiles
- C) Duck-billed Platypus between reptiles and mammals
- D) Sphenodon between reptiles and birds

3. **Analyzing Each Option**:
- **Option A: Archaeopteris**: This is an extinct organism and serves as a missing link between reptiles and birds, not a living connective link. Therefore, this option is incorrect.
- **Option B: Lungfish**: While lungfish do show characteristics that link fish (Pisces) to amphibians (which are closer to reptiles), they are not specifically a link between Pisces and reptiles. Thus, this option is not the best choice.
- **Option C: Duck-billed Platypus**: The platypus is a living organism that exhibits characteristics of both reptiles (such as laying eggs) and mammals (such as having mammary glands and fur). This makes it a strong candidate for a living connective link between reptiles and mammals.
- **Option D: Sphenodon**: Also known as tuatara, this is another example of a missing link but it is not a living connective link between reptiles and birds. Thus, this option is incorrect.

4. **Conclusion**: After analyzing all options, the Duck-billed Platypus (Option C) is the correct answer as it is a living connective link that provides evidence for organic evolution between reptiles and mammals.

### Final Answer
The living connective link which provides evidence for organic evolution is the **Duck-billed Platypus** (Option C).

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