How do Ladybird beetles and Dragonflies act as biocontrol agents?

Explanation

### Step-by-Step Solution:

1. **Understanding Biocontrol Agents**:
- Biocontrol agents are organisms that help to control pest populations, particularly those that harm crops. They can be beneficial insects, microbes, or other organisms that naturally reduce pest numbers.

2. **Role of Ladybird Beetles**:
- Ladybird beetles, commonly known as ladybugs, are effective biocontrol agents primarily because they feed on aphids. Aphids are small sap-sucking insects that can severely damage crops by draining their nutrients and spreading diseases.

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