Which of the following is an example of how industrial production of farming has led to a decline in the number of varieties of crops?
a. The availability of meat resources has decreased over time.
b. By the 1990s, only six varieties of corn accounted for 46 percent of the crop.
c. The variety of soy products has decreased over time.
d. The availability of resources to grow more varieties of crops has decreased over time.
Answer: b
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