Describe the overall function of any cell

Plz helppp!

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?

Which conditions need to be in balance for cells to function? check all that apply. blood sugar food intake body water body temperature body mass

Besides regulating what enters and leaves the cell, what is another function of your choice from question #1?