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[151] [150] Thus, according to Origen, Christ was both human and divine, [151] [150] but like all human souls, Christ's human nature was existent from the beginning. [152] [150] Origen was the first to propose the ransom theory of atonement in its fully developed form, [153] although Irenaeus had previously proposed a prototypical form of it. [153]
On the First Principles (Greek: Περὶ Ἀρχῶν / Peri Archon; Latin: De Principiis) is a theological treatise by the Christian writer Origen. It was the first systematic exposition of Christian theology. [1] It is thought to have been written around 220–230 AD. The full text has not been completely preserved. When Origen was around ...
Alpha keratin first evolves here; it is used in the claws of modern amniotes, and hair in mammals, indicating claws and a different type of scales evolved in amniotes (complete loss of gills as well). [20] Evolution of the amniotic egg allows the amniotes to reproduce on land and lay shelled eggs on dry land. They did not need to return to ...
Original mapping by John Snow showing the clusters of cholera cases in the London epidemic of 1854, which is a classical case of using human geography. Human geography or anthropogeography is the branch of geography which studies spatial relationships between human communities, cultures, economies, and their interactions with the environment, examples of which include urban sprawl and urban ...
The first debates about the nature of human evolution arose between Thomas Henry Huxley and Richard Owen. Huxley argued for human evolution from apes by illustrating many of the similarities and differences between humans and other apes, and did so particularly in his 1863 book Evidence as to Man's Place in Nature .
First tree sloths and hippopotami, diversification of grazing herbivores like zebras and elephants, large carnivorous mammals like lions and the genus Canis, burrowing rodents, kangaroos, birds, and small carnivores, vultures increase in size, decrease in the number of perissodactyl mammals. Extinction of nimravid carnivores.
Another periodization divides human history into three periods based on the way humans engage with nature to produce goods. The first transition happened with the emergence of agriculture and husbandry to replace hunting and gathering as the main means of food production. The Industrial Revolution constitutes the second transition. [575]
Charles Lyell challenged catastrophism with the publication in 1830 of the first volume of his book Principles of Geology which presented a variety of geological evidence from England, France, Italy and Spain to prove Hutton's ideas of gradualism correct. [25] He argued that most geological change had been very gradual in human history.