StickInsect_TheAge.txt:

^{|39 words|}The discovery calls into question one of the tenets of evolutionary biology: that if a species loses a complex characteristic, the gene or genes that express it will subsequently mutate so much that the function can never be recovered.

Matched paragraph from "Walking Sticks, Just Winging It (washingtonpost.com)":

^{|39 words|}The discovery calls into question one of the tenets of evolutionary biology: that if a species loses a complex characteristic, the gene or genes that express it will subsequently mutate so much that the function can never be recovered.

Matched document:

Walking Sticks, Just Winging It (washingtonpost.com).
http://www.washingtonpost.com/wp-dyn/articles/A63146-2003Jan15.html