What does the hemoglobin in red blood cells do to the circulatory system

Which of the following identifies the main culprit for america’s increasing weight gain?

Employers are required to provide guardrail, safety net, or personal fall protection systems to protect workers from falling off unprotected sides/edges of residential roofs that are feet or more above a lower level.

What system have glands found throughout the body that release hormones into the bloodstream