Question

multiple choice question
what is the main constituent of blood?
o hemoglobin
o iron
o water
o oxygen

Explanation:

Blood is mainly composed of plasma, which is mostly water. Water serves as a medium for transporting nutrients, waste - products, and other substances. Hemoglobin is a protein in red blood cells for oxygen - carrying, iron is a component of hemoglobin, and oxygen is transported by blood but is not the main constituent.

Answer:

C. Water