When the price per square meter is high, real estate companies will build higher buildings, resulting more densely populated cities. When land is cheap, as in smaller cities and villages, people tend to build lower buildings and therefore cities will be less dense.
This statement that best explains the reason why cities are densely populated is, Cities offer a wealth of 'opportunities' for citizens including education, jobs, access and healthcare.
<u>EXPLANATION:</u>
A city is a place where large human settles, generally have the extensive system for the housing, transportation, sanitation, health, education, utilities and communication.
The large population density facilitates the different parties like people, organization, business and government to interact with each other for the benefit of different parties.
The presence of a mountain range could isolate the gene pool of the species which would likely change or mutate characteristics may arise in the species. <span />
The astrolabe is an inclinometer, that is considered to ba analog calculator that is capable of solving the several different types of the astronomy and is mostly used measuring the altitude and the navigational aspects of the celestial bodies day and night and it was used in the Islamic golden age and the middle ages. It is also helpful in determining the land and the sea latitude.