Quote 1: (Difficulty: Easy)

"With savages, the weak in body or mind are soon eliminated; and those that survive commonly exhibit a vigorous state of health. We civilized men, on the other hand, do our utmost to check the process of elimination. We build asylums for the imbecile, the maimed and the sick; we institute poor-laws; and our medical men exert their utmost skill to save the life of every one to the last moment. There is reason to believe that vaccination has preserved thousands, who from a weak constitution would formerly have succumbed to small-pox. Thus the weak members of civilized societies propagate their kind. No one who has attended to the breeding of domestic animals will doubt that this must be highly injurious to the race of man. It is surprising how soon a want of care, or care wrongly directed, leads to the degeneration of a domestic race; but excepting in the case of man himself, hardly anyone is so ignorant as to allow his worst animals to breed."

Quote 2: Difficulty: Medium Easy

" In the long run nature eliminates the noxious elements. One may be repelled by this law of nature which demands that all living things should mutually devour one another. The fly is snapped up by a dragon-fly, which itself is swallowed by a bird, which itself falls victim to a larger bird … to know the laws of nature … enables us to obey them."

Quote 3: Difficulty: Medium

“The central question of the Chicago conference was whether the mechanisms underlying microevolution can be extrapolated to explain the phenomena of macroevolution.  At the risk of doing violence to the positions of some of the people at the meeting, the answer can be given as a clear No.”

Quote 4: Difficulty: Medium Hard

"No matter how large the environment one considers, life cannot have had a random beginning. . . . There are about two thousand enzymes, and the chance of obtaining them all in a random trial is only one part in (10²⁰)²⁰⁰⁰ = 10^40,000, an outrageously small probability that could not be faced even if the whole universe consisted of organic soup."

Quote 5: Difficulty: Hard

"An honest man, armed with all the knowledge available to us now, could only state that in some sense, the origin of life appears at the moment to be almost a miracle, so many are the conditions which would have had to have been satisfied to get it going."

Get them all right and you move on to the impossible challenge!