¿De qué catedral y peregrinos hablas?
The first, the multiregional hypothesis suggests that humans evolved from Homo erectus outside of Africa. ... The second hypothesis, or the African replacement hypothesis, suggests that Homo sapiens left Africa and then inhabited the rest of the Old World, replacing primitive humans that had already left Africa.
Stem cells are a class of undifferentiated cells that are able to differentiate into special cell types.
They are important because they represent an area in medicine, because they have the potential to regenerate and repair damaged tissue.
Not all stem cells come from embryos but also bone marrow, your teeth and other places.
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Billy the Kid first earned his reputation as a gunslinger in 1878, when he participated in a bloody frontier war in Lincoln County, New Mexico. The Kid left the war with a reputation as one of the West's most skilled gunmen, but he remained wanted for the murder of Sheriff Brady.
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