Precambrian Time Period-
The Precambrian time period was the beginning of earth, which was 4.5 billion years ago today. It was the earliest of the earths history. The volcanic activity during this time period created earths crust and some clouds in the sky; it also created the ocean. Fossils were found almost 600 million years ago. There were 3 types It was known as Ediacarans, these sea creatures grow on seabeds, and they didn't have any obvious heads, mouths or digestive organs. Some soft-bodied creatures were sponges. Not having any organs or a nervous system, they lived by drawing water through their bodies and filtering out food particles. The cnidarians, which included sea anemones, corals, and jellyfish, had sac-like bodies and a simple digestive system with a mouth but no anus. They caught food using tentacles armed with microscopic stinging cells. The third group, the annelids, or segmented flatworms, had fluid-filled body cavities and breathed through their skins.
Life Forms that were present at this time were called Cynobacteria. Those life forms were affected by nothing, because there was no mass extinction during this time period.
Life Forms that were present at this time were called Cynobacteria. Those life forms were affected by nothing, because there was no mass extinction during this time period.