How do protozoans feed?
The ones with a rigid surface have a soft spot in it called a mouth. Some of the hairs around the mouth whisk the water in such a way that it flows into the mouth. Algae in their water pass through the soft spot in the surface and are enclosed in a bubble of water inside the animal. The animal then releases chemicals called enzymes into the bubble, which break down the algae. When the algae have been broken down its soluble substances are taken into the animal’s body. The animals with a soft surface make arms, which flow round their food and make a bubble. They then digest their food with enzymes like the hairy protozoans.
