Learn about 3 1/2 Billion Years of Life on Earth in this educational video from dizzo95.
Read the full transcript »
Male Speaker: The written record of human civilization provides scan testimony on the 3.5 million years of life on earth, your death span were represented by a yearly calendar with early life originating on January 1, human society would not appear until one minute of mid night on December 31. scientist divide the geologic history of earth in to four eras. During the Precambrian Era the first and longest the simplest structures of life emerged bacteria and algae. 600 millions years ago the Paleozoic Era, followed with new more complexed species, more invertebrates, arthropods, molluscs, then vertebrates, the Mesozoic Era during 225 million years ago and brought the dinosaurs, who dominated life on land for 160 million years, by the end of the year the dinosaurs was stick to the worlds land masses at fracture drifted into continents. Setting the stage for the age mammals, today we live in the Cenozoic Era, which is 65 million years old, yeah, there are oldest direct ancestors walk the planes of Africa only 4 million years ago, primitive society tool making and forming a period of about 10,000 BC, and this way three-and-a-half million years it is easier to see our time as a tick on history's clock.