The changes that took place between the years of 700 and 1750 A.D. are:There was a gradual increase in deforestation and agriculture was extended throughout the years between 700 and 1750 A.D.As the habitat changed, many forest-dwellers migrated from one place to another.Temples, priests, markets, monasteries, etc were told to offer services and pay tax to local lords.These were part of large societies. Due to this, there was a great difference in social and economical status between the peasants. To know more about this chapter, visit the page NCERT notes For Class 7 Social Science and download the revision notes free of cost.