6. Which answer best explains the doubling time of the world’s population? A. It is getting shorter. C. It is remaining the same. B. It is getting longer. D. It is rising sharply, but in time will fall substantially

b i think it’s a water wheel turning in a stream

the atomic mass is the bottom number on the element.

-steel jelly

the answer is c

tell me if wrong

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.