<span>More than half of Africa's source of energy comes from coal. Its coal production and waste led to several environmental problems like wildfire and diseases. In one mine leak incident in Africa, last 1953 brought poison on the water supply killed thousands of marine life.</span>
Answer:
The 12 survivors are people who are married (6 couples), the word "single" is the keyword denoting those only people who are single had died.
I think it’s evaporation of moisture is greatest where it is cool and dry.