19.
Diversity, mutation.
The geneticists mentioned are studying a population
descended from a rather small number of people a rather long time ago.
Geneticists—who study genes, of course—would be interested in how the
genes of this population changed over time. Therefore, “the study of” both
genetic “diversity” and genetic “mutation” appropriately fit the blank.
“Revivification,” which means the restoration of life, and “rejuvenation” do
not fit because this sentence is not about bringing ancient people back to life.
“Therapy” and “history” have the wrong meanings.
20.
Triage, prioritize.
The words for the blank should match the clue “to
metaphorically separate the wheat from the chaff.” (Chaff is the inedible part
of wheat that is discarded before the wheat can be made into flour, so this
expression means to separate out the useful and non-useful, or important and
unimportant, parts of something.) You can also use the clues regarding “the
only way that a person can function” given an “influx of information.”
“Delete” and “eliminate” are attractive traps but don’t match the idea of
separating the important parts from the unimportant. Only “triage” (think of
what emergency room nurses do) and “prioritize” match. “Respond” and
“requite,” which means to reciprocate, are not good fits.
21.
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