Describe the main ideas behind the biological control of pests and diseases.

Explanation

### Step-by-Step Solution

1. **Introduction to Biological Control**:
Biological control refers to the use of living organisms to manage pest populations and diseases in agriculture. This method contrasts with traditional chemical control methods, which often have harmful effects on the environment and human health.

2. **Limitations of Chemical Control**:
Chemical methods for controlling pests and diseases can lead to adverse effects on both plants and animals. These chemicals can reduce crop productivity and pose health risks to animals and humans.

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