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 determine which creature developed into the first amphibians of Earth, let's analyze the options provided:

1. **Pilecosaurus** - This creature is not known to be a direct ancestor of amphibians. It is more closely related to reptiles and mammals.

2. **Theodont** - Similar to Pilecosaurus, Theodont is also not an ancestor of amphibians. It is associated with early mammalian evolution.

3. **Theropsis** - This creature is also not related to the evolution of amphibians. It is considered to be part of the lineage leading to mammals.

4. **Coelacanth** - This fish is significant in evolutionary biology. Coelacanths are considered to be ancient lobe-finned fish that had adaptations allowing them to survive in shallow waters. Their fins are thought to have evolved into limbs, which is a crucial step in the transition from aquatic to terrestrial life, leading to the development of the first amphibians.

Based on the analysis, the correct answer is **Coelacanth**. It is recognized as a key ancestor that contributed to the evolution of amphibians.

### Step-by-Step Solution:
1. **Identify the creatures listed**: Pilecosaurus, Theodont, Theropsis, and Coelacanth.
2. **Analyze each creature's evolutionary significance**: Determine if they are related to amphibian evolution or not.
3. **Conclude that Coelacanth is the correct answer**: It is a lobe-finned fish that evolved characteristics leading to the first amphibians.