Phylum Porifera : Station 1. This phylum includes the sponges and are the simplest of all animals. They have no bra in, nerves or gu t. Most are found in the ocean. They have pores in their body walls so that water can enter and they can filter feed.
1. Pores (meaning holes) in the body wall
2.Skeleton of spicules
3. No nervous system (meaning brain, nerves etc.)
4. Few organs and tissues and are multi-celled.