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Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
Early modern human expansion in sub-Saharan Africa appears to have contributed to the end of late Acheulean industries at about 130,000 years ago, although very late coexistence of archaic and early modern humans, until as late as 12,000 years ago, has been argued for West Africa in particular. [37]
Modern human presence in Southern Africa and West Africa. [60] Appearance of mitochondrial haplogroup (mt-haplogroup) L2. 80–50 ka MIS 4, beginning of the Upper Paleolithic. Early evidence for behavioral modernity. [61] Appearance of mt-haplogroups M and N. Southern Dispersal migration out of Africa, Proto-Australoid peopling of Oceania. [62]
A baby hatch was installed by Door of Hope Children's Mission (Hole in the Wall) in Johannesburg, South Africa in 1999 after the pastor, Cheryl Allen, learned that a high number of newly born infants were abandoned. Pastor Allen realised that many of those desperate women and girls may well have acted differently if there had been an alternative.
Homo sapiens (red) Expansion of early modern humans from Africa through the Near East. In paleoanthropology, the recent African origin of modern humans or the "Out of Africa" theory (OOA) [a] is the most widely accepted [1] [2] [3] model of the geographic origin and early migration of anatomically modern humans (Homo sapiens).
When World War II ended in 1945, the United Nations was founded in the hope of preventing future wars, [511] as the League of Nations had been formed following World War I. [512] The United Nations championed the human rights movement, in 1948 adopting a Universal Declaration of Human Rights. [513]
The first known hominids evolved in Africa. According to paleontology, the early hominids' skull anatomy was similar to that of the gorilla and the chimpanzee, great apes that also evolved in Africa, but the hominids had adopted a bipedal locomotion which freed their hands.
Implantation is the first stage of gestation, and, when successful, the female is considered to be pregnant. [3] An implanted embryo is detected by the presence of increased levels of human chorionic gonadotropin (hCG) in a pregnancy test. [3] The implanted embryo will receive oxygen and nutrients in order to grow.