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History (Syrgabaev Mukhammad Law-120) - Coggle Diagram

- - - - The Paleozoic differs from previous geological eras in the rapid development of life on the planet (about 340 million years). Skeletal organisms appeared - fish, from which the first amphibians descended, who managed to get out on land. By the end of the Paleozoic, amphibians, reptiles and even primitive mammals lived in coastal areas, the first insects appeared. Terrestrial plants arose that began to release oxygen, and in a relatively short period of time, the land was covered with forests of tree ferns and horsetails. An important event at the end of the Paleozoic was the formation of a huge supercontinent - Pangea.
    - - Mesozoic era , which lasted about 170 million years, is also distinguished by the originality of the flora and fauna. It was at this time that huge reptiles dominated the planet - dinosaurs, the largest of which reached 12 meters in height and 30 meters in length. They occupied all possible habitats: sea lizards existed in the sea, flying reptiles - pterosaurs soared in the air, and numerous herbivores and predators lived on land. Diplodocus is considered one of the largest herbivorous dinosaurs, whose weight reached 100 tons. One of the most famous and largest predators in the history of our planet is the tyrannosaurus rex.
    - - The Proterozoic is the longest geological era (about 2 billion years). During this period, algae, worms, molluscs, and crustaceans existed on Earth. According to scientists, in the Proterozoic, the concentration of oxygen in the atmosphere has already reached more than 10%. Together, the Archaean and Proterozoic make up almost 4/5 of the entire time of the existence of the Earth.
    - - The Cenozoic era is not only the youngest, but also the shortest, its duration at the moment is 67 million years. The Cenozoic era continues to this day. It was in the Cenozoic era that the modern outlines of the continents and oceans were formed, and the modern flora and fauna appeared. The main feature of the plant world is the dominance of flowering plants, the animal world - the predominant distribution of mammals and the appearance of man.
    - - Archean is one of the longest geological eras. Its duration is about 1.5 billion years. During this period, the earth's crust was formed - the upper layer of the lithosphere, the water and air shells of the Earth appeared. In the aquatic environment, according to many scientists, life originated. This is evidenced by deposits of limestone of the Archean age. Here the first simple organisms appeared - blue-green algae and bacteria. The primary atmosphere was unsuitable for the respiration of organisms: it consisted almost entirely of carbon dioxide, and there was no oxygen in it.