Which type of organisms are included in Kingdom Protista.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Kingdom Protista**: Kingdom Protista is a diverse group of eukaryotic organisms that are primarily unicellular, although some can form colonies.

2. **Characteristics of Organisms in Protista**:
- **Unicellular Eukaryotes**: The organisms in this kingdom are primarily unicellular and possess a defined nucleus and organelles, characteristic of eukaryotic cells.
- **Aquatic Habitat**: Most protists are found in aquatic environments, including freshwater and marine ecosystems.
- **Nutritional Modes**:
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