The first answer is correct (A).
Between the 8th and 13th centuries the period known as the Islamic Revival or Islamic Golden Age dates. During this period, personalities from the Islamic milieu as traders, academics and engineers made great contributions in various sectors of the region's culture, such as technology, science, philosophy, navigation, literature, arts, etc.
In this context, the introduction of paper was fundamental for the diffusion of knowledge, since it allows to fix the knowledge in manuscripts, besides saving classic works through the translation.
USA, Russia, France, Britain
To separate<span> the substances in a </span>compound<span>, a chemical reaction is required. Running electric current through water will produce hydrogen and oxygen gases. This process is called electrolysis. Substances in mixtures can be separated using physical change processes.</span>
Answer:
Reconstruction, in U.S. history, the period (1865–77) that followed the American Civil War and during which attempts were made to redress the inequities of slavery and its political, social, and economic legacy and to solve the problems arising from the readmission to the Union of the 11 states that had seceded at or before the outbreak of war. Long portrayed by many historians as a time when vindictive Radical Republicans fastened Black supremacy upon the defeated Confederacy, Reconstruction has since the late 20th century been viewed more sympathetically as a laudable experiment in interracial democracy. Reconstruction witnessed far-reaching changes in America’s political life. At the national level, new laws and constitutional amendments permanently altered the federal system and the definition of American citizenship. In the South, a politically mobilized Black community joined with white allies to bring the Republican Party to power, and with it a redefinition of the responsibilities of government.
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