An analogy I like to use is NASA finding a crashed spaceship in a cave located in Area 51.
A journal article suggests that an impressive instance of unguided evolution has been directly witnessed.
Species are surrounded by other species (often sharing the same body), and therefore may interfere with one another’s fitness.
Richard Lenski claims that his experiment provides “one of the most direct demonstrations of Darwinian adaptations by natural selection you can imagine.”
Perhaps the biggest evolutionary development in the course of the experiment involved some bacteria beginning to feed on citric acid.