Sponges, Sponges, Everywhere!

Sponges are great filter feeders If you do any diving anywhere, you will see sponges everywhere. Some of them are more colorful than corals, and some of them you can sit in. All sponges are water pumps and filters, which makes them useful in the sea and in our reefs. Sponges don’t move, they sit there, eat, and get fat. (Reminds me of one of my old girlfriends. She had the same complexion and personality as a sponge.) A typical sponge can pump 20,000 times its own volume in water through its cells in one day. All that water is also filtered by the sponge using “choanocytes,” which are just tiny, cone-shaped towers with sticky cells on them to catch food. Each tower has one flagellum, or hair-like thing
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