Which of the following is true regarding the cell membrane?

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?

How do you transfer mrna into codons ? i'm so confused : (

Why do carbohydrate molecules function so well as fuel for the body?