Charles darwin studied finches on the galápagos islands. the finches on each island had slightly different beaks. according to darwin, how did the finches all get different beaks?

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.