_________ have evolved as one of the biggest phenomena of the 21st century. 

The city has a lot to offer, including greater employment prospects, a higher level of living, as well as clubs, malls, shops, restaurants, and medical facilities. Theaters, amusement parks, cricket stadiums, etc. are available there for enjoyment. One of the largest 21st-century phenomenon is the evolution of cities. For a higher quality of life, people from the countryside are moving to the city. The pace of life in a large city is hectic. People from the countryside frequently relocate to cities in search of good jobs. It provides the best schools, universities, and institutions so that children can receive a proper education.