You are presented with the question "What do hormones control?" and the following answer choices: 
- Most plants
 - Plants growth
 - rocks
 - movement
 - trees
 - Heart rate
 - moon
 - athletes

Now knowing that hormones are chemical messengers that control many body functions and and like other downers, it slows bodily functions, including breathing and heart rate, choose the best answer.


 

      Heart rate   