Which is NOT a commonality among Hutus and Tutsis? A. ethnicity
B. race
C. nationality
D. religion
E. language

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Which organisims can cause diseases a. micro organisims b. multicellular organisnims c. both d. neither

Among the following environmental factors, which does not have a long-term impact on the composition of a region's soil? a. kinds of crops grown b. types of fungi present c. topography of the landscape d. variety of species of mammals e. number of freezes occurring annually