How Did The Excretory System Evolved On Earth?
How Did The Excretory System Evolved On Earth? Flame Cells of Planaria and Nephridia of Worms Planaria are flatworms that live in fresh water. Their excretory system consists of two tubules connected to a highly branched duct system. … Earthworms (annelids) have slightly more evolved excretory structures called nephridia, illustrated in Figure 2b. What excretory