What are advantages of biofertilizers over chemical fertilizers? Give an example of biofertilizer.

Explanation

### Step-by-Step Solution

1. **Definition of Biofertilizers and Chemical Fertilizers**:
- Biofertilizers are biological agents that enhance the nutrient content of the soil and promote plant growth. They are derived from natural sources and contain living microorganisms.
- Chemical fertilizers are synthetic substances created by humans that provide essential nutrients to plants, but they do not contain living organisms.

2. **Environmental Impact**:
- **Biofertilizers**: They are environmentally friendly as they are biodegradable and do not cause pollution. They help maintain soil health and promote biodiversity.
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