Animal phyla: sponges to molluscs - the Porifera or sponges: are aquatic, most marine and live fixed to the substrate. The body of a sponge is actually an aggregation of cells around a canal system. The water enters through the many pores of the wall, flows through the sponge body and exits through one or more larger openings Mennecke kiss. Cnidarians: most are marine eg coral or jellyfish Aurelia and others live in freshwater eg hydra. The features are named to the group k are upholstered cnidocistos tentacles (specialized cells that can be downloaded from the dams the toxins they contain) its life cycle is characterized by a polyp (shaped like a cylinder fixed to the substrate and at the opposite end is VOCA surrounded by tentacles. Some form colonies eg corals) and the jellyfish (it's free-living and paraguas.flota shaped mouth and the tentacles down) the annelids: some live in aquatic environments (marine worms) and others may live in terrestrial environments but still moist (leeches). They are worm-like and segmented body. They lack the rigid protective coating. Small segment of each post with stiff bristles which are attached to the substrate and avoid slipping to dsplazarse. Molluscs: They represent close to the edge but lost annelid segmentation and developed foot (muscle structure associated with locomotion), the visceral mass (internal organs) and mantle (k folds of tissue covering the visceral mass and secretes the shell or shell) Classes:-bivalves (clams and mussels) have a hatchet-shaped foot. its shell is formed by two leaflets united by a joint-cephalopods (octopus, cuttlefish) have the modified foot-shaped arms and tentacles around the head and have no or very small shells eg squid pen. , gastropods (snails, limpets) have a long walk on the k moves on the substrate. its shell is unique and sometimes does not exist.