Final answer:
The correct terms to fill in the blanks are 'long-distance' for migrations that involve a complete change of activity spaces with no overlap, and 'short distance' for migrations that result in new, yet partly overlapping, activity spaces.
Step-by-step explanation:
In long-distance displacement migrations, migrants travel so far that they have completely new activity spaces that do not overlap at all with their former home ranges. In short-distance displacement migrations, migrants move to a new residence nearby, with new activity spaces overlapping some of their former home ranges. The correct answers are therefore: A) Long-distance, Short distance.
Migrations can be driven by various factors such as employment opportunities, seasonal changes, or environmental conditions, leading to different types of movements such as diaspora or labor migration. Some migrations can also be the result of crises that force people to seek refuge in different geographical locations.