~General Information~ Worms are the most complex animals that I have studied. They are classified into three different phyla. There is a small number of species(20,000) of worms but there are a large number of worms. All worms have three layers of cells. They also have true organs and organ systems, and a complex nervous system. The Lumbricus terrestris earthworm is a segmented worm in the phylum Annelida. The earthworm is one of the most …showed first 75 words of 1532 total…

…showed last 75 words of 1532 total…of this organ. Each nephridia contains a small funnel and a long, coiled tube. The coiled tube leads to a bladderlike sac in the coelom. The cilia inside the funnel cause a wavelike motion that pushes waste through the tubes. The usable material that is pushed in to the tube diffuse into small capillaries that surround it. Once the waste products are in the bladderlike sac they are excreted through small pores on the worm.