1. Precambrian Era (earliest forms of life, such as bacteria and blue-green algae; later in the period, invertebrates such as jellyfish).
2. Paleozoic Era (Pangaea; invertebrate life, such as trilobites, later in the era, followed by development of vertebrates, including fish; development of vertebrates, amphibians, and the beginnings of reptiles; development of simple plants, such as mosses and ferns)
3. Mesozoic Era (Pangaea separates into continents; "Age of Reptiles"; dinosaurs, flowering plants, small mammals and birds)
4. Cenozoic (Present Era) Ice Age; mammoths; gradual development of mammals, birds and other animals recognizable today; humans; flowering plants, forests, grasslands.)
Edit:
Actually the above answer can be disputed. The Precambrian is not considered an era, it is considered a supereon that is divided into three eons. Two of these eons are subdivided into a total of seven eras. Combine that with the three eras of the Phanerozoic Eon, and you have ten.
So this question doesn't really make sense, considering there are actually ten eras.
1. The Creation
2. The Flood
3. Modern Day
4. Future Day
my mama
used to be a loyalist heartland
Spain, France, Great Britain, USA
There were many major results from WW I, which was a very influential event in human history, but I can select what I consider to be the 3 most important, which are: the end of the ruling dynasties of both Germany and Austro-Hungary, the destruction of the Ottoman Empire, and the Bolshevik Revolution.
hydrosphere, atmosphere, biosphere, and geosphere
Precambrian, Paleozoic, Mesozoic, Cenozoic. :)
Four eras. that is Cenozoic,mesozoic,paleozoic and precambrian
Idk i nede this anwsor thoogh or els i might fael my papor
The earth has four major spheres which are also called systems. The four major spheres of the earth includes the atmosphere, the biosphere, the hydrosphere, and the geosphere.
The four eras of business are natural resources, capital, personal resources, and entrepreneurship. The factors of production have changed through these eras by what drives the business will change.
Eons, Eras,Epochs, and period
Fat People
The earths mantle is one of the four major layers, laying between the crust and the outer core. At 2885 kilometers, it is the thickest layer.
hydrosphere sedimentary rock basalt ocean floor granite foundation
Precambrian Palezoic Cenozoic Mesozoic