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The book investigates the theoretical, moral, and biological issues surrounding the debate over the beginning of human life. Following a detailed analysis of the history of the question, Reverend Ford argues that a human individual could not begin before definitive individuation about two weeks after fertilization.
Discussions of the beginning of personhood may be framed in terms of the moment life begins. James McGrath and others argue the beginning of personhood begins is not interchangeable with the beginning of a human life. [6] [7] [8]: 845 According to Jed Rubenfeld, the terms human being and person are not necessarily synonymous. [7] [9] [10] [11]
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.
Science can observe these various phases of fetal development but cannot determine when human life begins. UrsaHoogle/E+ via Getty ImagesNow that the U.S. Supreme Court has given states final say ...
The earliest fossils of anatomically modern humans are from the Middle Paleolithic, about 300–200,000 years ago such as the Herto and Omo remains of Ethiopia, Jebel Irhoud remains of Morocco, and Florisbad remains of South Africa; later fossils from the Skhul Cave in Israel and Southern Europe begin around 90,000 years ago
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The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.
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