Which of the following has been a constant of urban life since the early 1900s? decreases in population relocation to suburbs building and sanitary codes increases in industrialization

The correct answer is: relocation to suburbs.

Urbanization brought crowds to the cities, which still makes a lot of people move to the suburbs in order to escape the crowd and maintain a calmer life, but still in a urban envinronment.

Also, suburbs are much cheaper, which makes it also a great option for people who need to work in the cities but can't afford to live next to their work.

definitely a for sure. ill see and update if i get the answer

the answer is aggresion hope this and mark me as brainiest and add me as friend