How did innovations such as irrigation, aqueducts, and improved farm techniques transform civilizations?

In 711 CE, the Moors invaded Spain and established Islamic rule. During this period, philosophy, mathematics, and science flourished in the nation. For instance, Ibn Zuhr, a physician and surgeon, tested medical procedures on animals before using them on humans. His work was translated into Latin and Hebrew and had a significant impact on the medical field. Spain remained closely connected to Baghdad for 200 years before becoming independent. Spain was one of the wealthiest areas of Europe during the period of Moorish rule. Based on the passage, how did the Moorish invasion of Spain affect civilization in the region?

How did innovations that developed over time-such as writing, trade routes, schools, and the printing press-affect societies?

A single population of modern humans migrated from southern Siberia . . . and crossed over to the Americas 16,500 years ago. . . . Sites all around the country . . . now provide more promising indications that the earliest Americans spread throughout the continent at least 14,500 years ago. Currently, the oldest claim for human settlement in the Americas lies at the Topper Site in South Carolina, dating back to about 15,000 years ago.' -"Other Migration Theories", Bering Land Bridge National Preserve, National Park Service Based on the text, how did the migration of the first people in America affect the region?

Leif said to his companions, "I propose now to divide our company into two groups, and to set about an exploration of the country. One-half of our party shall remain at home at the house, while the other half shall investigate the land; and they must not go beyond a point from which they can return home the same evening, and are not to separate [from each other]."' - "The Saga of Eric the Red", 1387, translated by Arthur Middleton Reeves, 1890 Based on the excerpt, what role did Leif Ericsson play in transforming Viking society?