281. A researcher who described a peaceful reunion between normally adversarial chimpanzees as a ______ was criticized for inferring human motives.
A. truce
B. competition
C. mischance
D. coincidence
E. miscalculation

282. Because insect communities serve as a sort of barometer, ______ conditions in their ______ , an entomologist's analysis of the insect species in a handful of soil can reveal much about the ecosystem.
A. preserving, habitat
B. stabilizing, range
C. observing, population
D. predicting, destination
E. registering, environment

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