Question

what is the function of a red blood cell?
○ carrying food molecules
○ sending electric signals
○ fighting disease
○ carrying oxygen

Explanation:

Red blood cells contain hemoglobin, a protein that binds to oxygen. They transport oxygen from the lungs to body tissues, and also carry carbon dioxide back to the lungs for excretion. Carrying food molecules is the role of the circulatory system's plasma, sending electric signals is done by nerve cells, and fighting disease is the function of white blood cells.

Answer:

carrying oxygen