Jovan Hadži theories of animal evolution. He devised a system of classification in which he divided the animal kingdom into six phyla: Protozoa, Parazoa, "Ameria" (animals with no segments), "Oligomeria" (animals with few segments), "Polymeria" (animals with many segments) and Chordata. His choice of characters important for classification was generally discredited by his contemporaries, and the system was never accepted by zoologists. However, due to its simplicity, the system was widely used in science education in former Yugoslavia. His other major theory was that of the origin of metazoa - he developed an existing hypothesis stating that the first multicellular animals resembling
Subgroups of Amish Amish". In the following, subgroups of Old Order Amish are listed from conservative to progressive: The Nebraska Amish are perhaps the most conservative group of Old Order Amish. They live mostly in Pennsylvania but they also have one small settlement in Ohio. Around 1880, Bishop Yost H. Yoder led nine families from Juniata County, Pennsylvania, to Gosper County in south-central Nebraska, founding an "Old Order" settlement that would last until 1904. Yoder went back to the Kishacoquillas Valley in Pennsylvania in 1881 to assist a conservative Amish group. Because bishop Yoder was living in Nebraska for some time, and the