Answer:
C. The reader’s comment is not a credible source because nothing is known about the person who wrote the comment.
Explanation:
It depends on where you live. Try both and compare. You can delete an app you don't want.
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:
highly developed nation with an aging population
