What type of digestion of food takes place in all protozoan protists ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Protozoan Protists**: Protozoan protists are unicellular eukaryotic organisms that belong to the kingdom Protista. They exhibit various forms of nutrition and digestion.

2. **Feeding Mechanism**: Protozoans utilize different methods to take in food. For instance, amoeba uses a process called phagocytosis, where it engulfs food particles using extensions of its cell membrane called pseudopodia. Paramecium, on the other hand, has a specialized structure called a cytostome (cell mouth) through which it ingests food.

3. **Digestion Process**: Once the food is ingested, it is enclosed in a food vacuole. This is a specialized structure within the cell that is responsible for digestion.

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