Bacteria live in a variety of locations one of which is the human mouth. which explanation supports the wide variety of bacteria in the mouth? a. accessibility to air cause bacteria to change form. b. salivary glands cause mutations in populations of bacteria. c. accessibility to nutrients makes the mouth a favorable habitat. d. calcium in the teeth provides appropriate ph levels in the mouth.

The answer is C.  Accessibility to nutrients makes the mouth a favorable habitat.

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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.