Fact 1: Endocrine hormones travel throughout the body in the blood.

Fact 2: Breathing affects the flow of hormones through the endocrine system.

Given the two facts above, answer the question "What process helps hormones travel throughout the body in the bloodstream?" with the following options: 
- hydration
 - mitosis
 - sleeping
 - sweating
 - oxygen
 - allow growth
 - eating
 - breathing


 

        breathing 