Sponges

Sponges are multicellular and have no organs or symmetry. Sponges have no body cavity and they can reproduce sexually or asexually. Sponges have no nervous system and they all live in water. All sponge have backbones and they ingest food through a process call filter feeding. Two examples of scientific names are Alcyonium digitatum and Calliactis polypus. There are about 10,000 species of spong discovered in the world.

These are all different species of sponges.