A Research Group Hypothesizes That Diet Influences the Distribution of Bacterial

question 74

Multiple Choice

A research group hypothesizes that diet influences the distribution of bacterial species inhabiting the human digestive system.The researchers define two populations with very different diets-one in England and another in Africa-for sample collection.They take fecal samples from each group and measure the percentage of each species of bacteria present in the samples.How is this investigation classified and why?

• A) This investigation is a controlled investigation because it was carried out using defined study populations.
• B) This investigation is a controlled investigation because controlled methods were used for the collection and analysis of fecal samples.
• C) This investigation is a comparative study because it compares a characteristic of two different groups that could be influenced by many variables.
• D) This investigation is a comparative study because it tests a hypothesis that was formulated by comparing the diets of two populations.
• E) This investigation is both a controlled and comparative study because it controls all but one variable influencing two study groups and then compares how that variable differs.

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