Since Darwin's time we have developed an understanding of heritability, identified examples of natural selection, and identified other causes of evolution besides natural selection. The basic bones have been highly modified to serve different functions but the bones are shared across many species. Fetal anteaters have teeth but the adults do not. Terrestrial amphibians pass through a stage that resembles aquatic larvae while still in the egg. Your goosebumps likely provided enhanced insulation when your ancestors were much hairier.
Dandelions produce flowers but the seeds develop without fertilization by pollen.
Some primitive moths still have small jaws even though they are not used. There are many examples of marsupials in Australia that are similar to placental mammals from the other continents. For natural selection to occur, three rules must be in place. There are three basic types of natural selection 1. Over time the population tends to have smaller fish.