Explanation:A noun ‘replacement’ is required to maintain the parallelism and‘replacement of X by Y’ is the correct usage. Both the conditions are met by Option B.Hence Option B is the correct answer.45. Researchers at Cornell University have demonstrated that homing pigeons can sensechanges in the earth’s magnetic field, see light waves that people cannot see, detect low-frequency sounds from miles away, sense changes in air pressure, and can identifyfamiliar odors.
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46. School desegregation has worked well in Buffalo, New York, in part because parentsand teachers were given major roles in designing the city’s magnet schools, because extrafederal funds were allocated to make each school unique, and because the federal judgeenforced desegregation orders.
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