is the following truth or false? lava flows on the moon sometimes overlap highlands, showing that maria deposits are younger than highlands

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

18. which statement about cancer is true?

Which structure in the cardiovascular system connect arteries to veins?