Passage 1 is adapted from "Ancient DNA Tells Story of Giant Eagle Evolution," © 2005 by Public Library of Science. Passage 2 is adapted from Tim Heupink, et al. "Dodos and Spotted Green Pigeons are Descendants of an Island Hopping Bird," © 2014 by BioMed Central.
question: In Passage 2, the description of a barcode mainly serves to _____
a trivialize the complexity of a particular research practice.
b use a familiar concept to communicate an idea.
c question the novelty of a scientific phenomenon.
d inject a note of levity into an otherwise serious argument.