Fact 1: Many plants respond to the days growing shorter in the fall by going dormant.

Fact 2: Trees are dormant from November to March.

Given the two facts above, answer the question "When do many trees respond to the days growing shorter?" with the following options: 
- air cools
 - Winter
 - wind
 - in fall
 - in summer
 - autumn
 - late winter
 - in spring


 

    in fall     