You are presented with the question "What can happen to a population when animals begin to migrate?" and the following answer choices: 
- It expands
 - harm them
 - it can change species
 - Move to another area
 - it can eat more
 - it can go extinct
 - it can fluctuate
 - Plant growth is reduced

Now knowing that migration is a type of movement that changes population size and population viability Population sizes are under constant fluctuation, choose the best answer.


 

       it can fluctuate  