Which of these best describes the tiny leg bones that some whales have, which do not aid in their movement or serve any other function? O structures that grow and improve in function as they are used
O structures that function at certain times of the year or under certain conditions
O structures that will become adaptations when the environment changes
O structures that have lost all or most of their function over evolutionary time

D. structures that have lost all or most of their function over evolutionary time

Explanation:

the question states that the leg bones are almost entirely unused because of evolution

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

feral cats are estimated to eat tens of millions of native animals each night in australia