Evidence that lead Darwin to develop his theory of evolution of species by natural selection includes all of the following, EXCEPT
a. The Galapagos Islands have a unique species found only on one volcano- the pink iguana.
b. Finch species on the Galapagos Islands resembled a common species on the mainland, but were clearly differentiated by traits related to feeding habits.
c. Geologists had demonstrated that the Earth was billions of years old.
d. English gardeners had long known that it was possible to breed many novel varieties of vegetables from a single species just by selecting and reproducing individuals with specific desirable traits. e.
e. Geologists had discovered that Earth's surface was in constant, but slow, motion.