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.
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