Answer:
Demography is the study of population structure and change. Strictly it is the study of the characteristics of populations – primarily age and sex – as well as births, deaths and migration. In other words, the patterns and trends of population change.
Explanation:
To establish a settlement, means to bring in a relatively group of large people who build houses, have jobs, form a society, and inhabit this area for a long period of time.
The answer I believe is Army. Sorry it's making me have more words
I'm pretty sure it's D because the other three choices are critical, east asia needs clean water, food, && energy.
