Which hormone is required for metamorphosis in frogs?

Explanation

**Step-by-Step Solution:**

1. **Understanding Metamorphosis in Frogs**:
- Metamorphosis is the biological process where an organism undergoes significant physical changes from its larval stage to its adult form. In frogs, this involves the transformation from a tadpole to an adult frog.

2. **Identifying the Larval Stage**:
- In frogs, the larval stage is represented by the tadpole, which is aquatic and has gills for breathing underwater.

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