From lakes and grasslands with hippos and giraffes to a vast desert, North Africa's sudden geographical transformation 5,000 years ago was one of the planet's most dramatic climate shifts.
The transformation took place nearly simultaneously across the continent's northern half, a new study finds. The results will appear in an upcoming issue of the journal Earth and Planetary Science Letters.
http://www.livescience.com/28493-when-sahara-desert-formed.html
The correct answer would be C.
In the 15th and 16th centuries, an increased number of vogages occurred all around the globe, to longer distances each time. This allowed the western civilization to stablish contact with the rest of Africa, America and Oceania.
The ability to travel further distances came because 2 things: the development of better ships, such as the galleon, and the advancements in navigation technology, which allowed the ship to reach it's destination even in months-long journeys across the ocean. The astrolable was one of such technological advances, allowing the sailors to identify the position of a celestial body in the sky, and triangulate the position of the ship from that information.
Answer:
During the Paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering plants and fishing, hunting or scavenging wild animals. The Paleolithic is characterized by the use of knapped stone tools, although at the time humans also used wood and bone tools.
Explanation:
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