The sum of michael's tidal volume, inspiratory reserve volume, and expiratory reserve volume is called his the sum of michael's tidal volume, inspiratory reserve volume, and expiratory reserve volume is called his vital capacity pulmonary space dead space

The correct answer is vital capacity (VC).  

Vital capacity is the full amount of air that the lungs can expel after having been filled to maximum. It can be a measure of a person’s respiratory health and is usually measured regular spirometer.

I think the answer is obtain nutrients. Since vascular plants reproduce have roots to get nutrients in even dry areas. Non vascular plants are low growing and do not have roots for absorbing water so they must live in I guess tropical places in order to survive getting/obtaining nutrients.