refers to the ecological process involved in the concentric zone model in which a new category of people or type of land use arrives in an area previously occupied by another group or land use.

Invasion

Explanation:

Invasion refers to the ecological process involved in the concentric zone model in which a new category of people or type of land use arrives in an area previously occupied by another group or land use

Concentric zone model is a one of the first theoretical  model created by Ernest Burgess in 1925 in a bid to explain urban social structures . the model views  cities as a series of five circular rings or zones that starts from a central district or area usually a business district