What the Precambrian period looked like at the beginning
Precambrian Time
The Precambrian era began almost 4.5 billion years ago. This era started when the earth formed. The first period in this area is the Azoic. The atmosphere and oceans were just forming about the time the Azoic period started.. Then during the Archeozoic some forms of algae began to produce. Lastly the Vendian Period brought things like simple celled animals such as a jellyfish. So basically the earth was forming and simple and singled celled animals began to grow and evolve.
Life appeared around 6 million years after the earth had just begun. Scientists think the first form of lives were forms of bacteria and other single celled organisms. Some of the last forms include jellyfish, sponges and certain types of worms, so still really small animals. The environment was very cold and mostly water. So it was very cold surface temperatures.
The era ended in the ice age. The thing that ended or believed to end the era is the ice age. It is about 88% of the earths time. So bassicaly it lasted a long time and it ended in a ice age. That Era then started a new Era.
My sources: http://science.nationalgeographic.com/science/prehistoric-world/precambrian/ and http://www.geo.msu.edu/geogmich/Precambrian.html and http://www.britannica.com/EBchecked/topic/474302/Precambrian-time.
Life appeared around 6 million years after the earth had just begun. Scientists think the first form of lives were forms of bacteria and other single celled organisms. Some of the last forms include jellyfish, sponges and certain types of worms, so still really small animals. The environment was very cold and mostly water. So it was very cold surface temperatures.
The era ended in the ice age. The thing that ended or believed to end the era is the ice age. It is about 88% of the earths time. So bassicaly it lasted a long time and it ended in a ice age. That Era then started a new Era.
My sources: http://science.nationalgeographic.com/science/prehistoric-world/precambrian/ and http://www.geo.msu.edu/geogmich/Precambrian.html and http://www.britannica.com/EBchecked/topic/474302/Precambrian-time.
one of the first jellyfish
The first living organisms
