Biology 11th Edition by Cecie Starr ,Ralph Taggart

Exercise 3

At the end of your backbone is a coccyx, a few small, fused-together bones. Is the human coccyx a vestigial structure-all that is left of the tail of some distant vertebrate ancestors Or is it the start of a newly evolving structure
Formulate a hypothesis, then design a way to test the predictions you make based on the hypothesis.