It is B because the message sends it to the nervous system
-exchange led to the creation of larger, more powerful states
-the spread of Buddhism and Islam
-spread of epidemic diseases beyond local regions, with sometimes devastating effects
-spread of plants, animals, technological
-It altered consumption patterns
-encouraged specialization and diminished the economic self-sufficiency of local societies
-means of social mobility, traders often becoming a distinct social group
-Gab between rich and poor grew
-New civilizations developed along roads, places for merchant to stop
Because it shows the ages of the population, so we can see the parts of the place with the population that can and can't work.
Now, the way these maps show social information is: because they point out the demographical distribution about a specific sub-group in the population, its age, and its growth.
And finally, the way these maps provide environmental information is: because they allow us to see the environment of certain zones inside the map territory.
The answer is 27/4 Decimal Form: 6.75