Question

lo 3.3. what do veins carry back to the heart? deoxygenated blood oxygenated blood nutrients waste products carbon dioxide

Explanation:

Veins are blood vessels that carry deoxygenated blood back to the heart. Arteries carry oxygenated blood away from the heart. Nutrients are absorbed in the digestive system and transported in the blood, but veins specifically carry deoxygenated blood. Waste products like carbon dioxide are transported in the blood (including in veins as part of deoxygenated blood), but the main thing veins carry back to the heart is deoxygenated blood.

Answer:

Deoxygenated blood