Porifera

Feeding - sponges are filter feeders and Carnivorous Respiration - Sponges cells absorb oxygen by diffusion from water into cells as water flows through body, into which carbon dioxide and other soluble waste products such as ammonia also diffuse Circulation - sponges do not have distinct circulatory, respiratory, digestive, and excretory systems, instead the water flow system supports all these functions. They filter food particles out of the water flowing through them. Particles larger than 50 micrometers cannot enter the ostia. sponges also Excretion - they extract bacteria and other micro-organisms from water very efficiently Movement - Although adult sponges are fundamentally sessile animals, some marine and freshwater species can move across the sea bed at speeds of 1–4 mm per day, as a result of amoeba-like movements of pinacocytes and other cells. A few species can contract their whole bodies, and many can close their oscula and ostia. Juveniles drift or swim freely, while adults are stationary Reproduction - most sponges are sexually produced but some are asexually born