Plants are vital for life on Earth due to the following reasons:

1. **Oxygen Production**: They produce oxygen through photosynthesis.
2. **Climate Regulation**: Plants absorb carbon dioxide, helping to reduce greenhouse gases.
3. **Habitat and Biodiversity**: They provide habitats and food for many species, supporting biodiversity.
4. **Soil Health**: Plant roots prevent soil erosion and enhance soil fertility.
5. **Water Cycle**: Plants help regulate the water cycle by absorbing and releasing water.