Sponges are pretty amazing animals. Their cells
work together, but are also pretty independent.
Each cell gets its oxygen directly from the
water that flows through the sponge all the
time. The carbon dioxide leaves the same way.
No cell is far from this constant flow. There’s a
great video at:
that shows how fast the water
Some of the cells have a flagellum, which is
shaped like a hair, but can whip around to move
water. Each cell is tiny, but they are powerful
working together. They use the flow of water
to help them trap the tiny particles of food they
eat. They don’t have a digestive system.
Each cell breaks down the particles itself.
One amazing result of the cells being
independent is that if you push the sponge through
a mesh, and break it into tiny pieces, those
pieces find each other and make new sponges!
Why do you think it’s so uncommon for the cells to
be so independent?
If you are interested in questions like these,
you may want to study zoology (the study of
Thanks for asking,