I would go with 50 since according to recent statistics %47 percent of Africans already live in an urban environment. Could the question be outdated?
Presidential vetoes, some people from senate or the house of representatives might kill a bill and keep it from becoming law.
<u>Explanation:</u>
When a bill gets vetoed by the president, then the bill goes back to the congress. The congress for getting the bill passed has to over ride the bill by getting at least a majority vote of two thirds.
But the over riding of the veto is very difficult because getting so many votes in majority is very tough. So if the over riding does not take place, the bill dies and does not become a law.
A. Purple Dye
The Phoenicians' “Tyrian purple” came from a species of sea snail now known as Bolinus brandaris, and it was so exceedingly rare that it became worth its weight in gold.