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

Fact 2: Metabolism is the sum of all the chemical processes in a living organism.

Given the two facts above, answer the question "What increases the rate of all the chemical processes in living organism cells?" with the following options: 
- Thyroid hormones
 - Blood Cells
 - Hair Follicles
 - oxidation reaction
 - Temperature changing
 - Skin Cells
 - temperature
 - heat energy


 

 Thyroid hormones        