First vertebrates which attempted transition from water to land are

Options

A. reptiles
B. birds
C. amphibians
D. insects

Answer

**Step-by-Step Solution:**

1. **Understanding Vertebrates**:
- Vertebrates are animals that possess a backbone or spinal column. They are characterized by having a spinal cord that is surrounded by cartilage and bone.

2. **Identifying the Options**:
- The options provided are reptiles, birds, amphibians, and insects. We need to determine which of these groups first transitioned from an aquatic environment to a terrestrial one.

3. **Analyzing Each Option**:
- **Reptiles**: These are primarily land-dwelling animals that evolved after amphibians. They are not the first to transition from water to land.
- **Birds**: Birds evolved from theropod dinosaurs and are not the first vertebrates to make the transition from water to land.
- **Insects**: Insects are invertebrates and do not belong to the vertebrate category.
- **Amphibians**: Amphibians are the first vertebrates that made the transition from water to land. They have adaptations that allow them to live both in water and on land.

4. **Conclusion**:
- Based on the analysis, the correct answer is **amphibians**. They were the first vertebrates to attempt the transition from water to land.

**Final Answer**: The first vertebrates which attempted the transition from water to land are **amphibians** (Option 3).

---