Based on the arrows, in which direction at air masses moving?

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 was darwins theory of common decent

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii