The human mouth has a plethora of bacteria species. why is there so much variety of bacteria in the mouth? a. lots of air cause the bacteria to mutate. b. saliva causes bacteria to mutate. c. nutrients in the mouth create a favorable habitat. d. calcium in the teeth provides the proper ph.

well, i believe that the answer is 2. : 3

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.