The density gradient model most closely resembles the... urban model.
This model establishes particles are not equally distributed but there are some zones with more or fewer particles. Moreover, particles move from a higher concentration zone to a lower concentration zone.
The density gradient model mostly resembles the demographic transition model that explains the density of demographic zones changes over time as more people move to the zone or people leave the zone. This is similar to density gradient because it shows density is not uniform and it evolves.
Learn more about urban in: https://brainly.com/question/26609978
