Posted at Evolution News Friday: In The Origin of Species (1859, 201), Charles Darwin suggested the following test, among others, for his theory:  If it could be proved that any part of the structure of any one species had been formed for the exclusive good of another species, it would annihilate my theory for such could not have been produced through natural selection. Now, there are thousands of different plant galls triggered correspondingly by thousands of different insect (and other) species showing, indeed, that “part of the structure of … one species had been formed for the exclusive good of another species.” Getting to Know Plant Galls But perhaps I should first answer the question: What is a plant gall?  A gall is a manifestation Read More ›