The diversity of the hominins included increasingly specialized:

The diversity of hominids included increasingly specialized Diets. A hominid is defined as having two obligated behaviors which include the Bipedal locomotion and non honing chewing complex with the foundation behavior of bipedalism. 

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.