Tatiana Maslany by kanyewesteros

Question 8

The titles of Orphan Black episodes (examples: Season 3's "The Certain Agony of the Battlefield" and Season 2's "By Means Which Have Never Yet Been Tried") come from a different piece of writing or speech for each season. Which seminal (and appropriate) work provided the titles for all the episodes in Season 1?

On The Origin of Species