Context: DST is generally not observed near the equator, where sunrise times do not vary enough to justify it. Some countries observe it only in some regions; for example, southern Brazil observes it while equatorial Brazil does not. Only a minority of the world's population uses DST because Asia and Africa generally do not observe it.

Question: Which part of Brazil observes Daylight Saving Time?
Answer: southern Brazil

Question: What part of Brazil does not observe DST?
Answer: equatorial Brazil

Question: Which two continents that comprise a majority of the population worldwide don't observe DST?
Answer: Asia and Africa

Question: The lack of fluctuation in time for what daily event means regions of the world near the equator don't usually keep DST?
Answer: sunrise