Fact 1: Thyroid hormones increase the rate of metabolism in cells throughout the body.

Fact 2: Thyroid hormones are produced by the thyroid gland.

Given the two facts above, answer the question "what produces hormones?" with the following options: 
- ferns
 - humans
 - glands
 - chemicals
 - animals
 - insects
 - Wasps
 - cows


 

   glands      