You are presented with the question "What happens to cottonwoods when the days get shorter?" and the following answer choices: 
- They bloom
 - They go dormant
 - Dehydration
 - It helps them survive
 - Exfoliation
 - They die
 - They reproduce
 - They may not survive.

Now knowing that many plants respond to the days growing shorter in the fall by going dormant and cottonwoods are dormant during the fall, choose the best answer.


 

  They go dormant       