This is an area with a high number of people, or high population density, living close together.

Urban

Explanation:

An urban area is an area with a high population density. This means that a large number of people live closely together. However, the exact definition of what constitutes an urban area can vary depending on the country and time period we talk about. Historically, urban areas have been more industrialized than rural ones. However, they have also experienced problems such as poverty and epidemics.

answer; depression and breathing related sleep disorder(independent);

answer; use multiple stimuli;