Respuesta :
Answer:
D
Explanation:
because when some organisms will move from one place to another the number of population will decrease
					                   If it’s only one choice then the answer is D because if a bunch of bears moved into a city, people would leave the city. 
If it’s more than one choice then the answers are A and D because lack of rain can cause droughts which many people don’t want to live through.
					                
					             If it’s more than one choice then the answers are A and D because lack of rain can cause droughts which many people don’t want to live through.
 
					                  