Me with this does anyone know any of these give answers i need with hw i'm in a !

Number 1: The Circulatory System is a vast network that contains organs and vessels.

number 2: Arteries have a thick wall which helps a powerful pressure from the heart.

number 3: Without the Circulatory System the body wouldn't be unable to maintain a internal environment.

number 4: The Circulatory and Respiratory system both have gas to help a or animal live in there internal environment.

number 5: Blood vessels brings oxygen to the tissues and absorbs carbon dioxide and other waste products to clear the lungs. And with out oxygen the tissues won't absorb carbon dioxide to clear out the lungs.

number 6: D

They use the si unit, or metric system its all the same thing

Of the cold they can survive in the cold