Researchers sequenced bacterial DNA found in the stomachs of humans to analyze the human microbiome. They compared the microbiomes of stomachs from healthy humans to those of stomachs from humans infected by H. pylori. What can you conclude from these data? 
A) H. pylori killed the other types of bacteria in the stomach.
B) The number of H. pylori bacteria in infected stomachs is larger than the number of Firmicutes bacteria in uninfected stomachs.
C) H. pylori infections result in reduced diversity of stomach bacteria.
D) Mechanical digestion is negatively affected in infected stomachs.
Correct Answer:
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