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.

C.  Accessibility to nutrients makes the mouth a favorable habitat.

Explanation:

Bacterial are single celled, prokaryotic organisms. They can be found in many living habitats such as water, air, soil, food and even in the body of other living organisms.

Bacteria can be found in the human mouth where they get access to the food particles which remain inside the mouth, but are not digested. The nutrients present in these food particles are degraded by these bacteria resulting in foul smell.  Thus the accessibility of nutrients in the mouth makes the suitable environment for the survival of the bacteria.