What evidence did Darwin use to support his theory of evolution? Check all that apply.

in-depth studies of individual organisms
observations of fossils
finches on different islands had different types of beaks
young finches that acquired desirable traits as they aged
observations of different species with varying traits

Charles Darwin, on his voyage, visited the Galápagos islands, and observed the finches (among other species, of course). He saw that in every island, the birds were adapted to the particular environment. For example, finches that eats small insects has sharp and thin beaks, differently from finch species that usually feed from large seeds, which posseses large and tough beaks. Also some of them had different beaks to feed from cactus fruit or pulp.