Fact 1: Hormones are chemical messengers that control many body functions.

Fact 2: Hormones are a functional class of chemicals.

Given the two facts above, answer the question "What are hormones?" with the following options: 
- it needs them
 - cells
 - Plants growth
 - messengers
 - positive
 - infections
 - kinetic
 - disease


 

    messengers     