Fact 1: Migration is a type of movement that changes population size.

Fact 2: Insects can also migrate.

Given the two facts above, answer the question "When insects move from one place to another, this usually causes" with the following options: 
- seed dispersal
 - Transfers energy
 - change in mood
 - death and devastation
 - change in population size
 - change in individual insect
 - change in shape
 - converting mass to energy


 

     change in population size    