Which of the following would best be shown on a map?A. How the number of immigrants has changed over the history of the United States
O B. How the percentage of citizens feeling positive about the
president has changed over time
C. How the population density of different states has shifted over the
past 100 years
O D. Which supplies were commonly taken on the trail by westward
pioneers

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explanation:

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it was a big part of the story, making a lot of plot points happen?

i dont understand the question you are asking

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.