You are presented with the question "Many plants go dormant during the  " and the following answer choices: 
- heat or cold
 - earth's revolving
 - autumnal equinox
 - colder and wetter
 - It helps them survive
 - cloudy and rainy weather
 - Plant growth is reduced
 - fire conditions

Now knowing that many plants respond to the days growing shorter in the fall by going dormant and after the autumnal equinox, days gradually shorten in the Northern Hemisphere, choose the best answer.


 

   autumnal equinox      