Mongol leader Genghis Khan (1162-1227) rose from humble beginnings to establish the largest land empire in history. After uniting the nomadic tribes of the Mongolian plateau, he conquered huge chunks of central Asia and China. His descendants expanded the empire even further, advancing to such far-off places as Poland, Vietnam, Syria and Korea. At their peak, the Mongols controlled between 11 and 12 million contiguous square miles, an area about the size of Africa.
If plants in the rainforest and desert were able to share what they each have in abundance, rainforests would be less lush and deserts greener. Plants in the rainforest compete to reach the sun with broad leaves and tall stems, while desert plants evolved to store water. Most rainforests receive more than 100 inches of rain annually, while deserts barely collect 10 inches of precipitation a year in a good year, with periods of droughts frequently occurring. These drastic differences caused the plants within these two biomes to develop and adapt to their distinctive living conditions in different ways to help them thrive.
The correct answer is the election of Abraham Lincoln for president of the United States by the electoral college in 1860.
