Sponges' bodies are made up of a non-living jelly-like mass sandwiched between two main layers of cells. Sponges have no nervous systems, their middle jelly-like layers have large and many different populations of cells, and some types of cells in their outer layers can move into the middle layer and change their functions. |
Fun Fact- This sponge is often used for decorative
purposes in saltwater aquariums.
purposes in saltwater aquariums.