They made do, but there is no evidence. SORRY! :)
Sponges are not plants but animals .
A calcisponge is any of a group of marine sponges containing calcareous spicules - spicules which resemble calcium carbonate.
The calcareous tubeworm is a marine worm. It is commonly found in the intertidal zone, but may live at depths up to 100 meters.
Sponges don't have skeletons! They are invertebrates which means the creature doesn't have a backbone, but in this case, it doesn't have a skeleton! (I think this is right, I apologize if it isn't)
The three classes of sponge skeletons are siliceous or glass sponges (Class Hexactinellida), calcareous sponges (Class Calcarea), and sponges with a fibrous protein skeleton (Class Demospongiae). Each class has unique structural characteristics that support the sponge's body.
There are thousands of different types of sponges, so there's not enough room to list them all. Here's a great website showing several hundred different sponges found in the Caribbean so you can get some idea of the different groups they fall into.
yes sea sponges.
Sponges live in saltwater lakes, sea, and oceans. Some sponges live in freshwater.
They live underwater.smart one
Sponges do live in the ocean.
in the water
calcareous alge adaptations