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

Fact 2: Everyone has a different metabolism.

Given the two facts above, answer the question "what effects everyone differently?" with the following options: 
- density
 - cigarettes
 - Earth orbiting the Sun
 - gravity
 - thyroid hormones
 - force
 - Climate change
 - Temperature changing


 

     thyroid hormones    