The answer should be A. to maintain low air pollution levels.
Its population has increased
Answer:
4. J
5. C
6. F
7. G
Sorry if any of these are wrong
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</span>
<span>The
most important and revolutionary mechanical innovation of the medieval
agricultural revolution was the plough. During the medieval age, the plough
fundamentally improved and was used with multiple oxen teams. This enabled more
land to be ploughed and crops planted.</span>
