You are presented with the question "When insects move from one place to another, this usually causes" and the following answer choices: 
- 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

Now knowing that migration is a type of movement that changes population size and insects can also migrate, choose the best answer.


 

     change in population size    