Four differences between Arteries and Veins

Veins

1l carry blood from tissue of the body to the heart

2) are usually found closer beneath the skin

3) are less muscular then arteries

4) collapse if blood flow stops

arteries

1) carry blood back away from the heart to the tissue of the body.

2) found deeper within the body

3) are more muscular then veins

4) would generally remain open even if blood stops because of it's muscular structure.

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explanation:

the supermassive black hole is in the middle of the galaxy.