True because they are like man made pain killers that your body produces
The Pan Hellenic games is the collective name for four separate sports in ancient Greece. Those four games included chariot racing, boxing, wrestling, and various foot races
Answer:
True
Explanation:
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
they are not in a food group because they are in carbohydrates and carbohydrates are not a food group
