Question

the red blood cells contain ______ which takes oxygen to all parts of the body.
options: hormones, hemocytes, hemoglobin, plasma

Explanation:

• Hormones are chemical messengers, not for oxygen transport.
• Hemocytes are blood cells in invertebrates, not relevant here.
• Hemoglobin is a protein in red blood cells that binds to oxygen and transports it.
• Plasma is the liquid part of blood, not in red blood cells for oxygen transport.

Answer:

C. hemoglobin