Porifera

Porifera is a phylum of invertebrates containing sponges. Sponges are the simplest as well as the oldest of all of the invertebrates.Sponges have no symmetry, in other words, there is no line that can be drawn on a sponge to divide it into two mirrored halves. Sponges do not have body openings, instead they have pores that function for obtaining nutrients and they use water to propel waste away from them. Sponges reproduce asexually by budding, and sexually bu releasing sperm and eggs into the water and having the eggs get fertilized. When budding occurs, a smaller sponge begins to grow on the parent sponge. Sponge also have a great abilito to regenerate, if a piece of a sponge breaks off it can become a new sponge. Sponges do not have a true circulatory system, instead they filter water through their bodies and obtain oxygen by diffusion, the movement of some form of matter from an area of high concentration to an area of lower concentration.





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