Answer:
Arteries carry oxygenated blood from the heart, while veins carry oxygen-depleted blood back to the heart. ... The pulmonary veins transport oxygenated blood back to the heart from the lungs, while the pulmonary arteries move deoxygenated blood from the heart to the lungs.)
I think it might be A. By helping them stay healthy enough to work
The answer is Nutrition.
Plz give BRAINLIEST if possible
