A sponge doesn't have a mouth like animals do. Instead, it has pores all over its body.

Here's how it works:

* Water flows through the pores: Sponges filter food and oxygen from the water that flows through their pores.

* Collar cells: Inside the sponge, special cells called collar cells capture food particles from the water.

* No digestive system: Sponges don't have a digestive system like other animals. They digest food directly within their cells.

So, instead of a mouth, sponges rely on their porous structure and specialized cells to obtain food and nutrients.