Question

1. sometimes you may not realize that a bird species is migratory because you see members of the species throughout the year. for example, robins that live in missouri during most of the year migrate to texas for the winter. canadian robins, however, migrate to missouri for the winter. the ____ are replaced.

a belongings
b imports
c populations
d applicants

Explanation:

The text describes bird - species migrations where different populations of robins move to different locations, implying one population replaces another in a particular area.

Answer:

C. populations