Some species that appear to be very different from other species can actually have similar anatomy. For example the scientist believe that whales involved from land mammals. One reason for this is the presence of several function less hind limb bones still found eternity in the number of whale species. What is the term for a reduced often function some species that appear to be very different from other species can actually have similar anatomy. For example the scientist believe that whales involved from land mammals. One reason for this is the presence of several function less hind limb bones still found eternity in a number of whale species. What is the term for a reduced often functionless anatomical structure that serves as evidence in an organisms evolutionary past