While some commentators suggest that abstraction and complexity in scientific research are signs that a given direction is misguided, Lisa Randall, a professor of physics at Harvard, counters that these qualities instead reflect the success of human ingenuity in (i)____________ the increasingly (ii)____________ challenges that nature presents. They can, however, make it more (iii)____________ to communicate scientific developments, even to colleague. A. creating B. difficult C. challenging D. meeting E. conspicuous F. unproductive G. eschewing H. pragmatic I. advantageous