A protozoan locomotes by one of three structures ……..,………. Or ……….

Explanation

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for the three structures that protozoans use for locomotion.

2. **Recall the Structures**: Protozoans are known to use different structures for movement. The three primary structures are:
- **Pseudopodia**: These are temporary projections of the cell's cytoplasm that help in movement and feeding.
- **Cilia**: These are short, hair-like structures that cover the surface of some protozoans and help them move in a coordinated manner.
- **Flagella**: These are long, whip-like structures that propel the protozoan through its environment.
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