Magma is inside the earth, while lava is at the earths surface true or false

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?

Four types of motile cells in human body?

What are the four basic classes of organic molecules how do they differ structurally and functionally