Answer:
Agriculture allowed people to stay in one place, and increased food production caused the population density to expand far beyond levels that could be sustained by hunting and gathering alone. This growth in population density provided a critical mass of people to sustain and spread contagious infectious diseases.
Answer:
is used to define locations on a model of the surface of the earth
Explanation:
the GCS uses a netwirk of imaginary lines to define locations
1. A- the economy faced serious challenges
2. B- Modernized
Democracy is the correct answer
