There are about 5,000 species of sponges found throughout the world. Most sponges are found in oceans, although some groups are found in fresh waters such as lakes. They were the first group of animals that has specialized cells to do special jobs.
However, the cells are not so advanced as to form tissues. Sponges live individually or in colonies. Porifera (sponges) take in water through their pores. They also have advanced forms like taking in water through canals that move the water all throughout the sponge. The oxygen from the water is then used.
However, the cells are not so advanced as to form tissues. Sponges live individually or in colonies. Porifera (sponges) take in water through their pores. They also have advanced forms like taking in water through canals that move the water all throughout the sponge. The oxygen from the water is then used.