Sponges even use the choanocyte when it's time to reproduce.

The flagella and collar work together to gather food. Sponges use the flagella to move when they are larvae. It's a cell that has three basic parts: flagella, collar, and cell body. Those flagella are part of a cell called a choanocyte. The entire life of a sponge revolves around one type of cell. Suck the water in, filter out the food, and send the water out. Then the water gets pushed out of the sponge through a hole called an osculum. When the water moves through the sponge, tiny food particles are filtered out of the water by the flagella.

Water is sucked in through holes/ pores in the side of the sponge. Those flagella are constantly moving and keeping the water circulating inside of the sponge. Sponges are in the shape of a big 'U.' On the outside of the U are protective cells, but on the inside are these very special cells with little flagella (wildly whipping tail structures). Sponges do not have nervous systems, so they don't react to the world around them. Sponges are really just a bunch of specialized cells working together to help the entire organism survive. Once the larvae land on a piece of rock, they take root (so to speak) and that's that, forever anchored. Baby sponges don't look like adult sponges, so scientists use another word.

The word larva is another way to describe them when they are babies. There was a time in their lives when they were little larvae that they were swimming around the water all by themselves. Most sponges live their lives attached to a reef. There are two basic forms in the life cycle of a sponge. When we talk about sponge structure, remember all the holes. You may have even seen a couple around your bathtub! The ones around your bathtub might look like sponges but they are usually man made. Most sponges are found in seawater, only a few in fresh water.

They are so basic that they have not developed many of the characteristics you might think of when you think of animals. Sponges - The First Invertebrates Sponges are kind of like the exception to the rules of invertebrates.

How does water move through sponge