When someone exercises vigorously, their breathing is described as demonstrating:
a. hyperpnea, involving deeper but not faster breathing.
b. hyperventilation, involving both deeper and faster breathing.
c. bradypnea, involving deeper and slower breathing.
d. hypopnea, involving shallower but faster breathing.

A. hyperpnea - required so the body can meet the metabolic demand of tissues

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

This is the most closely resembles the model.