What are the main features of the flora and fauna of different geological eras?

1. The first era is the Archean. Only one thing is known about her. The whole earth during this era was filled with volcanoes, from that moment nothing has survived to the present. The era ended 2.5 billion years ago.
2. The second era is the Proterazoic. At that time, dinosaurs appeared, semi-modern continents and islands began to form, as well as the first multicellular ones. It is also known that there were rock formations in Proterase. Scientists also found out that dinosaurs became extinct due to the fact that then oxygen was poison for living beings. The era ended about 2 billion years ago.
3.Paleozoic era. The continents are beginning to form in a similar modern form. Appear: fish, amphibians, molluscs. The era ended about 250 million years ago.
4. Fourth era – Mesozoic. Birds, mammals, flowering plants began to appear. The land is covered with vegetation. The era ended 65 million years ago.
5. And finally our era, the Cenozoic. Nowadays there are many animals, birds and plants. Intelligent beings appeared – people. The era began 66 million years ago and continues to this day.