Darwin faith! fully maintained this method of interpreting facts - by seeking explanations of past events by observing occurrences in present time - throughout his life31. The lucid writing style of Lyell and straightforward conclusions influence all of his work. When unearthing remains of extinct animals in Argentina he noted that their remains more closely resembled those of contemporary South American mammals than any other animals in the world. He noted "that existing animals have a close relation in form with extinct species", and deduced that this would be expected "if the contemporary species had evolved form South American ancestors" not however, if thereexisted an ideal biota for each environment. When he arrived on the
Galapagos islands (islands having been formed at about the same time and characteristically similar),