Crushing food with our teeth is essential to generate small, uniformly textured particles, facilitating smooth passage through the digestive tract.

In Paramoecium, food is taken in at a specific spot facilitated by cilia movement covering the cell surface, unlike the entire surface feeding seen in Amoeba.

Amoeba takes in food through temporary extensions of the cell surface, forming a food vacuole. Complex substances inside the food vacuole are broken down into simpler ones, diffusing into the cytoplasm, and undigested material is expelled at the cell surface.