Bonjour,
1. Arteries carry blood from the heart to the rest of the body, whereas veins carry blood from the rest of the body back to the heart.
2. Almost all arteries carry oxygenated blood and almost all veins carry deoxygenated blood.
3. Arteries have a thick elastic muscle layer, whereas the muscle layer for veins is much thinner.
The answer is D
I hoped this helped
800,000 to 1.5 million nephrons on average per kidney
2.)for they can grow green leaves through Photosynthesis in which plants convert energy from the sun.