Definition: Given a text, write a compressed version of it in a single sentence.
Input: Now, evolution by such preadaptations, or exaptations, are not rare; they are the grist of adaptive evolution. Thus arose the lung, the ear, flight, presumably most major adaptations and presumably many or even all minor ones as well.
Output:
Evolution by preadaptations or exaptations aren't rare; but the grist of adaptive evolution. Thus arose the lung/the ear/flight, most major adaptations and even all minor ones.