Answer:
Radar
Explanation:
Radar was developed as a means to track incoming enemy aircraft and find ground targets to bomb.
Throughout America, the number of participants in choirs has increased where more than 42.6 million individuals (both adults and children combined) are now considered to be part of some choral group.
There are more than 270,000 choral groups all across America (in 2009, as per the study). This participation is far more than any other performing arts.
1 in 6 Americans (above 18) sings in a chorus.
In 2009, the percentage has increased from 14% to 17%.
This information is taken from The Chorus Impact Study of 2009 which can be referred to for further details on Choral Singing and its impact on American life.
The study also examines the effect of choral singing on children and their development along with many other social aspects.
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Urbinization is basically citys and buildings which means more people and more money . I hope that answerd your question