The sun rises due east and sets due west.
the world's current population is 7.3 billion and the world population in 1915 was 1.8 billion. The increase over the past century is 7.3 billion - 1.8 billion = 5.5 billion. So, the correct answer would be "more than 5 billion" (option D).
It is difficult to make generalizations about the highland climate zone because little research has been done at high altitudes, and data is not readily available. Without actual data, it would be wrong to make any generalization about the highland climate zone.
Hope this helps
