1) The creation of the Earth 4.5 billion years ago: The creation of the Earth is extremely important because without it there would be nowhere with life (that we know of), and humans would most likely not exist. Because there is no clear way of how the Earth came to be and why, many different cultures and religions have different ideas of how the Earth was created. Here is an excerpt from the Japanese text Kojiki on how the Earth was created. It is very different from our western views.
http://ancienthistory.abc-clio.com/Search/Display/1468191?terms=creation+of+the+earth
2) The first oxygen-breathing animals appear: This change was important because otherwise, humans would not have eventually evolved into what we are today. Also, animals that do not breathe oxygen are very basic, and are mostly just single-celled organisms. Among some of the most basic oxygen breathing animals still living are fish. They were also some of the first animals that breathed oxygen.
http://school.eb.com/eb/article-66210
3) Oldest known tool fashioned by man in Africa: Without tools, humans would have a hard time gathering and cooking food, and building shelters, which are a key to human survival. Tools are important for everyday tasks, and are still used today. The oldest known tools were made in Africa in the Paleolithic period, and this article talks about what type of tools were made in the Paleolithic period.
http://ancienthistory.abc-clio.com/Search/Display/579874?terms=tools
4) First true man, Homo erectus, emerges in East Indies and Africa: This change is extremely important because it was the first time humans existed. Obviously, if they did not emerge then, then humans would not exist today, and the world would be a much different place. This article explains what the Homo erectus people where.
http://ancienthistory.abc-clio.com/Search/Display/579812?terms=homo+erectus
5) Earliest written code of laws drawn up in Sumner: Without the law, everything would be complete chaos. People would steal, and murder, and commit all sorts of crimes because there would be no punishment. The law is also an important part of developing a society, and that is what this change shows. Although this code was not written as early as the first code of laws, this article talks about an early code of laws.
http://ancienthistory.abc-clio.com/Search/Display/592440?terms=earliest+written+code+of+law
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