15. Between 1348 and 1350, almost one-third of the population of Europe A. migrated to urban trading centers
B. bought their freedom from feudal landholders
C. died in an epidemic of bubonic plague
D. joined the Third Crusade

as the maasai legends tell, "in the beginning of the world, enkai was the only god: the guardian of rain, fertility, sun, and love. with that love, enkai birthed three sons." solución

ok sorry the answer is a. by their religion

i think the answer is the one about environmental and social health.

hope this

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation: