Multiple Choice
Here's a rather specific question concerning U.S. historical agricultural data. Which of the following increased fivefold from 1950 to 1980?
A) number of farms
B) use of horses and mules per farm
C) number of farmers
D) use of chemical fertilizers per acre
E) acreage needed to feed horses and mules
Correct Answer:
Verified
Correct Answer:
Verified
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