GRE Text Completion Question 3613
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Source: PP2
Although the genetic explanation of why some people are right-handed whereas others are le ft- handed is plausible, it has been effectively_____ by experiments in which genetically _____ mice showed different paw preferences.
- A verified . . related
- B challenged . . indistinguishable
- C tested . . altered
- D proven . . identical
- E destroyed . . complex