Answer:si
Explanation:hope I helped
Answer:
Arteries carry oxygenated blood away from the heart. Veins carry the blood back to the heart. 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.
Explanation:
300 BC by Greek philosophers
Normally cooks with microwaves emitting from a device in the microwave(sorry,I don't know the name of the device)
Answer: when one is lost, one is formed
