The first attempt to solve of mechanism of organic evolution was made by `:`

Options

A. Haeckel
B. De Vries
C. Lamarck
D. Darwin

Answer

**Step-by-Step Text Solution:**

1. **Identify the Question**: The question asks who made the first attempt to solve the mechanism of organic evolution among the given options: Heckel, Tivreis, Lamarck, or Darwin.

2. **Recall Historical Context**: In the 19th century, several scientists contributed to the understanding of evolution, but we need to focus on who made the first significant attempt.

3. **Focus on Key Figures**: Out of the options provided, we need to consider the contributions of each scientist:
- Heckel: Known for his work in paleontology.
- Tivreis: Not a well-known figure in the context of evolution.
- Lamarck: A French zoologist who proposed early ideas about evolution.
- Darwin: Known for the theory of natural selection, but he came after Lamarck.

4. **Examine Lamarck's Contribution**: Jean-Baptiste de Lamarck is recognized for his early theory of evolution, which suggested that organisms evolve by modifying their existing traits to adapt to their environments. He is famous for the example of giraffes, which he claimed developed long necks to reach higher foliage.

5. **Conclusion**: Based on the historical contributions to the understanding of organic evolution, the first attempt was made by Jean-Baptiste de Lamarck.

6. **Final Answer**: The correct answer is **Lamarck**.

---