This graph shows life expectancy in the United States. A graph titled Life Expectancy in the U S. The x axis shows the years 1960 to 2010. The y axis shows life expectancy, from 64 to 80. The line starts at under 70 in 1960, 71 in 1971, 73 in 1980, 75 in 1990, 77 in 2000, 78 in 2010.

Which factor best explains why the graph changes from 1990 to 2010?
A. New technology protects soldiers from risky reconnaissance missions.
B. New technology allows farmers to grow genetically modified crops.
C. New technology allows us to find and use new energy sources.
D. New technology has improved medical imaging and surgery.

answer; the correct answer to the above statement is world trade center towers were build///110 story north tower of the original world trade center was

(e) a major consequence of the election was that several southern states

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.