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Human history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers . They migrated out of Africa during the Last Ice Age and had spread across Earth's continental land except Antarctica by the end of the Ice Age 12,000 years ago.
In this sense, history is what happened rather than the academic field studying what happened. When used as a countable noun, a history is a representation of the past in the form of a history text. History texts are cultural products involving active interpretation and reconstruction. The narratives presented in them can change as historians ...
During the Paleozoic, many modern groups of life came into existence. Life colonized the land, first plants, then animals. Two significant extinctions occurred. The continents formed at the break-up of Pannotia and Rodinia at the end of the Proterozoic slowly moved together again, forming the supercontinent Pangaea in the late Paleozoic. [148]
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
In addition, Alfred Wallace independently used the concept of the struggle for existence to help come to the same theory of evolution. [3] Later, T.H. Huxley further developed the idea of the struggle for existence. Huxley did not fully agree with Darwin on natural selection, but he did agree that there was a struggle for existence in nature. [4]
The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence , mainly fossils .
The Zaidiyyah historically come from the followers of Zayd ibn Ali. The Alawites are a distinct religion that developed in the 9th/10th century. Historically, Twelver Shia scholars (such as Shaykh Tusi) did not consider Alawites as Shia Muslims while condemning their heretical beliefs. [108] Ibn Taymiyyah also pointed out that Alawites were not ...
The evolutionary history of species has been described as a "tree" with many branches arising from a single trunk. While Haeckel's tree is outdated, it illustrates clearly the principles that more complex and accurate modern reconstructions can obscure.