The reason why surveying a different number of people or different population of people can possibly change the percentages that you calculated is because these surveys are simply "samples" of the general population as a whole, and are not exact in terms of their results given any random sample.
True! His was made up of only four people, while today it's made up of 16.
Answer:
Number One:
The Tang ruled China between the seventh and tenth centuries.
The Song dynasty ended in 1279.
The Song dynasty lasted more than 300 years.
Number Two:
It was a time of harmony, stability, and achievement.
Number Three: the vulnerability to invaders from the north
Number Four: I'm Not Sure
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