Durante gran parte de la Edad Media se había extendido en la agricultura el uso del sistema derotación bienal. Este consistía en dejar reposar la mitad de un terreno después de la cosechamientras la otra mitad era labrada. Este modelo fue sustituido por el sistema trienal que implicabadividir la tierra en tres partes y cultivar solo dos, mientras una tercera quedaba en descanso(barbecho), lo que permitió

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.

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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what was the significance of the plessy vs ferguson ruling and jim crow laws

answer the impact. plessy v. ferguson allowed 'separate but equal, also known as segregation, to become law in the united states