_______evolved into the first amphibians.

Answer

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

1. **Understanding the Question**: The question asks what evolved into the first amphibians. This requires knowledge of evolutionary biology and the lineage of vertebrates.

2. **Identifying Key Time Period**: The evolution of the first amphibians occurred around 350 million years ago (Mya). This is an important time frame in the study of vertebrate evolution.

3. **Identifying the Ancestors**: During this time, a specific group of fish known as "lobe-finned fish" (often referred to as "lophins" in the transcript) played a crucial role in the transition from aquatic to terrestrial life.

4. **Evolutionary Transition**: Lobe-finned fish are characterized by their fleshy, lobed fins, which are thought to be the precursors to the limbs of amphibians. Over time, these fish adapted to life on land, leading to the emergence of the first amphibians.

5. **Conclusion**: Therefore, the answer to the question is that "lobe-finned fish" evolved into the first amphibians.

**Final Answer**: Lobe-finned fish evolved into the first amphibians.

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