Give common examples of protozoa.

Explanation

**Step-by-Step Solution:**

1. **Understanding Protozoa**: Protozoa are unicellular organisms that belong to the kingdom Protista. They are eukaryotic, meaning they have a well-defined nucleus and organelles.

2. **Characteristics of Protozoa**: Protozoa are primarily heterotrophs, which means they cannot produce their own food and rely on other organisms for nutrition. Many protozoa are known to cause diseases in humans and other animals.

3. **Common Examples of Protozoa**:
- **Plasmodium**: This protozoan is responsible for causing malaria, a serious disease transmitted by mosquitoes.
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