sea sponges are found in mostly in salt water, but a few live in fresh water.
fresh water
I found an interesting article on WIKIPEDIA about sponges, it is very interesting but does not mention as to if sponges have brains or not. http://en.wikipedia.org/wiki/Sea_sponge
Most types of sponges have asymmetrical bodies. There are around 10 thousand different types of sponges found in bodies of water all over the world.
Blood cells
Sponges are aquatic animals that live in freshwater or marine environments. They can be found attached to rocks, reefs, or other hard surfaces on the ocean floor. Sponges are filter feeders, meaning they pump water through their bodies to collect food particles.
Most types of sponges have asymmetrical bodies. There are around 10 thousand different types of sponges found in bodies of water all over the world.
sea sponges are found in mostly in salt water, but a few live in fresh water.
SPONGES
Sponges found in the phylum Porifera.
Spicules
The structural protein found in all sponges is collagen. It provides support and structure to the sponge's body, allowing it to maintain its shape and function.
The common name for calcareous sponges is "calcareous sponges" or simply "calcareous sponges." These sponges belong to the class Calcarea and are characterized by their calcium carbonate spicules. They are typically found in marine environments and can vary in shape and size.