Background statement on teenage pregnancy

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?

What field of science did harry hess study?

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?