Sponges feed by filtering water through their pores and tubes into a central cavity before expelling the water through an osculum. They come in both round and elongated shapes. Humans use natural sea sponges for washing.

1. Sponge (Porifera)
Àngela Amengual and Angel Jiménez

2. First, the water enters through the pores,
through the tubes, to the central cavity.
Second, the water stays in the central cavity
at the time of his expulsion.
Third, the water is expelled through the
osculum.

3.  Sea sponges feed on particles in suspension
in the water: are filter.

4.  Sponges can have both round shapes, as
more elongated shapes
 Long shape Round shape
 Long shape

5.  We humans, we use natural sponges to wash
us.

6. The End