A) following antibiotic treatment.
B) following a fecal transplant.
C) following a dietary change.
D) following the use of a new probiotic.

A) Few microbes can survive because it is so acidic.
B) The alkaline environment supports a wide variety of species.
C) Despite the acidic of the stomach, diverse phylotypes of resident microbes thrive in the stomach.
D) There is a rich diversity of transient microbes, but few resident microbes.

A) lower microbial diversity than those without.
B) significantly greater microbial diversity than those without.
C) slightly greater microbial diversity than those without.
D) unpredictable levels of microbial diversity in comparison to those without chronic periodontitis.