Where the grasslands were plentiful and how they have shrunk due to farming
What they have in common: climate, terrain, inhabitants, maintenance/growth
What the grasses are like/how they grow
The author's primary purpose is to describe the general features of grasslands.
The overall tone of the passage is informative.
A conclusion that can be drawn from the first paragraph is that farming and ranching have contributed to the reduction of Grasslands.
In this passage, the author shows bias against diminishing grasslands for croplands and grazing.