Question

Outline the major events in animal evolution/themes of animal evolution, including types of body cavities and their descriptions, and give examples of animals that display these themes .

Answer 1

progressive tree. evolution of neevous number Darwinism in animals takes place from single ccel Protoroa to multicellue Homo sapiens Homosapiens has highest place on During evolution, single cell Peeteroa develops in te melticellulare met9200 Cephalization, of a distinct bead and increasing concentration system and exceptional sendes head. Metazoa involves large animal as of reported to the chain evolution. The first member of metazoa. is sponges that is also known Porifera Eño tissues anyt syeteme). After this, the nematodes aye included in Darwinism history. They have tissue grade of organizati nization and first necuous system appears in this animal. In respect of digestive digestive system with no body canely of as digestive system Protozoa have inter cellular

also have intercellulare and a Porifera digestion body cauity with Engie opening. Coelenterates" platyhelminthes alto lave alimentary canal neith single opening Body cauity is tube live and like. These all the animals are known as acoelomate. canal compounded. The b During the evolution the elementary and body cavity become more difficult. The body cauity of higher animals is tube with in a tube like! Basically this type of arrangement develops mose efficient digestion of feod. volutionary proces, organ system of nignes anmall becomes more complex And via this evolu the