Some adaptations on the other hand become . these adaptations are vestigial leg bones the remains of an author include this selection

1) to show that certain animal species don't need any structural adaptations in order to survive

2) to introduce the idea that animals can have structural adaptations that they wind up not needing

3)to highlight the importance of environmental changes on adaptations and exaltations

4)to provide support for the idea that ocean animals are move likely to have useless adaptations