Who wrote People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf and what does it mean? George Orwell is credited for writing this. There are some who will disagree with this though.
The Hadean eon represents time before the reliable (fossil) record of life beginning on Earth; it began with the formation of the planet and ended at 4.0 billion years ago as defined by international convention. The Archean and Proterozoic eons follow; they produced the abiogenesis of life on Earth and then the evolution of early life. The succeeding eon is the Phanerozoic, which is represented by its three component eras: the Palaeozoic; the Mesozoic, which spanned the rise, reign, and climactic extinction of the non-avian dinosaurs; and the Cenozoic, which presented the subsequent development of dominant mammals on Earth.
The Precambrian life forms were less developed than the Paleozoic life forms. The Precambrian life forms were just starting to develop because this was 544 million years ago. that meant that things still needed to grow.uring the Cambrian period of the Paleozoic era, there was an explosion in the evolution of â¦ life forms. In the Precambrian, life was restricted to the sea.