Nerve net Nerve net A nerve net consists of interconnected neurons lacking a brain or any form of cephalization. While organisms with bilateral body symmetry are normally associated with a central nervous system, organisms with radial symmetry are associated with nerve nets. Nerve nets can be found in members of the Cnidaria, Ctenophora, and Echinodermata phyla, all of which are found in marine environments. Nerve nets can provide animals with the ability to sense objects through the use of the sensory neurons within the nerve net. The nerve net is the simplest form of a nervous system found in multicellular organisms. Unlike
Subgroups of Amish Subgroups of Amish Subgroups of Amish developed over the years, as Amish churches have divided many times over doctrinal disputes. The 'Old Order' Amish, a conservative faction that withdrew from fellowship with the wider body of Amish in the 1860s, are those that have most emphasized traditional practices and beliefs. There are many different subgroups of Amish with most belonging, in ascending order of conservatism, to the Beachy Amish, New Order, Old Order, or Swartzentruber Amish groups. Donald B. Kraybill, Karen M. Johnson-Weiner and Steven M. Nolt speak in their book "The Amish" of different Amish "affiliations". They define an