Question

which best describes red blood cells? they are colorless. they protect against disease - carrying microorganisms. they transport oxygen throughout the body. they aid in blood clotting.

Explanation:

Red blood cells contain hemoglobin which binds to oxygen and transports it throughout the body. They are red in color, white blood cells protect against pathogens, and platelets aid in blood - clotting.

Answer:

They transport oxygen throughout the body.