Darwin wrote many of the premises of 'the theory of evolution by natural selection' by noting differences in the of closely related while studying in the galapagos islands. a) feet, finches. b) beaks, finches. c) feather color, tortoises. d) dietary preferences, tortoises.

The correct answer is B. beaks, finches

Explanation:

One of the main elements Darwin used to write "The Theory of Evolution by Natural Selection" was his observation of finches on the Galapagos island. Charles Darwin visited Galapagos during the 1830s and in there he observed multiple species of finches that differ in the shape of their beaks. This caught Darwin's attention who determined the shape of the beak varied according to the diet the species had. For Darwin, this shown all the finches derived from the same ancestor and their beaks and other features were the results of natural selection and evolution. Thus, Darwin wrote his theory by noting the differences in the beaks of closely related finches.