Which statement best defines a hormone? 

A)  It is a new form of chemical insecticide waiting approval by FIFRA. 
B)  It is a chemical that travels in the bloodstream and controls an organism's growth and development. 
C)  It is a strong herbicide used to improve growth and development 
D)  It is a species-specific chemical sex attractant.

Hormone

Chemical substances produced in the body that regulate and control the activity of certain cells or organs, essential for every function of the body.

Bloodstream

The system of blood vessels (arteries, veins, and capillaries) through which blood flows within an organism, delivering oxygen and nutrients to tissues and removing waste products.

FIFRA

The Federal Insecticide, Fungicide, and Rodenticide Act, which is a United States law that sets up the basic U.S. system of pesticide regulation to protect applicators, consumers, and the environment.