What observations did Darwin make on the Galápagos Islands that helped convince him that evolution occurs?
a. the existence of animals that did not fit into Linnaeus’s classification system;
b. the similarities and differences among cacti and tortoises on the different islands;
c. the presence of species he had seen on other tropical islands far from the Galápagos;
d. the radioactive age of the rocks of the islands;
e. fossils of human ancestors
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