When we consider the vastness of the universe and the uniqueness of life, like the stars we observe from millions of years ago, we realize that both biological and cosmic evolution are processes illustrating the dynamic and ever-changing nature of existence. Darwin's study of finches on the same island revealed that from the original seed-eating birds, many other forms with altered beaks evolved, leading to insectivorous and vegetarian finches. Similar patterns are seen with Australian marsupials. Evolution is driven by natural selection.