During gaseous exchange terrestrial mammals breathe in (a) air and breathe out carbon dioxide (b) oxygen and breathe out carbon dioxide (c)air with with a high concentration of oxygen and breathe out carbon dioxide (d)air with a high concentration of oxygen, and breathe out air with a high concentration of carbon dioxide

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.