In Precambrian eon the planet was consist of bacteria and archaea.the planet was very simple and consist of prokaryotes (single cell) organisms, eukaryates and Stromatolite. Even some soft bodied organisms that didn’t have actual head was present at this time. The recambrian ended because of Cambrian exmplosion and camprina p[eriod started. Cambrian explosion is not an actual explosion rather is a period of diversification of organisms.at this time the oxygen level of planet increased so new life started to form. This event caused the skeletal and shelted organisms to diverstified. new typed of phyla came about during the cambran explosion that include phylum cnidaria (jellyfish, corals, sea anemones), phylum Arthopoda (crustaceans, insects,
