Answer:
C
Explanation:
it takes a few months before you can detect the virus in the blood and at that stage the symptons apear because the virus gas taken over
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.)