En qué condiciones se hallaba la medicina para enfrentar a la peste negra?

albany plan of union, 1754. the albany plan of union was a plan to place the british north american colonies under a more centralized government

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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determination