Name some diseases caused by protozoa.

Explanation

### Step-by-Step Solution:

1. **Understanding Protozoa**: Protozoa are single-celled eukaryotic organisms that belong to the kingdom Protista. They are characterized by having a well-defined nucleus and various cell organelles.

2. **Nutritional Mode**: Protozoans are heterotrophs, meaning they depend on other organisms for their food and nutrition.

3. **Identifying Diseases**: Several diseases are caused by protozoa. Here are some notable examples:
- **Amoebiasis**: Caused by the protozoan *Entamoeba histolytica*. This disease primarily affects the intestines and is spread through contaminated food and water.
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