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12. With which molecule does blood readily combine?
A. Glucose
B. Oxygen
C. Water vapor
D. Plasma.


Sagot :

OXYGEN

The molecule with which blood readily combines is B. Oxygen.

Blood combines readily with oxygen through the process of oxygenation in the lungs. Hemoglobin, a protein in red blood cells, binds to oxygen molecules in the lungs and carries them throughout the body via the bloodstream. This oxygenated blood delivers oxygen to tissues and organs, where it is essential for cellular respiration and energy production.

Therefore, oxygen (B) is the correct answer as it specifically refers to the process of oxygenation and the binding of oxygen to hemoglobin in red blood cells.