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d) Historians are now agreed that beginning in the 17th century and continuing throughout the 18th century, England witnessed an agricultural revolution.

b) English (and Dutch) farmers were the most productive farmers of the century and were continually adopting new methods of farming and experimenting with new types of vegetables and grains.

a) They also learned a great deal about manure and other fertilizers.

c) In other words, many English farmers were treating farming as a science, and all this interest eventually resulted in greater yields.