Which of these is an example of the creature which later developed into the first amphibians of Earth ?

Options

A. Pelycosaurs
B. Thecodonts
C. Therapsids
D. Coelacanths

Answer

To solve the question "Which of these is an example of the creature which later developed into the first amphibians of Earth?" we will analyze the given options and understand the evolutionary relationships.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Pelicosaurus
- B) Thicodon
- C) Therapsid
- D) Coelacanth

2. **Understand the Evolution of Amphibians**: Amphibians are believed to have evolved from fish-like ancestors during the Devonian period. The key group of fish that contributed to the evolution of amphibians are the lobe-finned fishes.

3. **Analyze Each Option**:
- **Pelicosaurus**: This is an early synapsid, not directly related to the evolution of amphibians.
- **Thicodon**: This is not a well-known group in the context of amphibian evolution.
- **Therapsid**: This group evolved from synapsids and is more closely related to mammals than amphibians.
- **Coelacanth**: This is a lobe-finned fish that is considered a direct ancestor of the first amphibians. Coelacanths are known for their fleshy, lobed fins, which are similar to the limbs of tetrapods.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is **D) Coelacanth**. Coelacanths are significant in the study of vertebrate evolution as they represent a lineage that eventually led to the first amphibians.

5. **Conclusion**: The first amphibians of Earth evolved from lobe-finned fishes, particularly coelacanths, which adapted from aquatic to terrestrial life.