Which of the following evolved into the first amphibians?

Options

A. Lobefins
B. Synapsids
C. Sphenopsids
D. Dinosaurs

Answer

To determine which of the following evolved into the first amphibians, we need to analyze the options provided: Lophins, Synapsids, Sphenopsids, and Dinosaurs.

### Step-by-Step Solution:

1. **Understanding the Evolution of Vertebrates**:
- The first vertebrates were fishes. Over time, these fishes evolved into amphibians. This evolutionary transition is crucial for understanding the origins of amphibians.

2. **Analyzing the Options**:
- **Lophins**: This group includes bony fishes. It is known that during the Devonian period, around 370 million years ago, certain bony fishes evolved into the first amphibians.
- **Synapsids**: This group includes mammals and mammal-like reptiles. They are not directly related to the evolution of amphibians.
- **Sphenopsids**: These are a group of plants, specifically horse tails, and do not relate to the evolution of amphibians.
- **Dinosaurs**: These were large reptiles that evolved much later than the first amphibians and are not ancestors of amphibians.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Lophins**, as they are the bony fishes that evolved into the first amphibians during the Devonian period.

### Final Answer:
**Lophins evolved into the first amphibians.**

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