I am pretty sure the answer is B human tailbone
** b. human tail bone. is the correct answer.** ;
The correct answer is B. human tail bone, which is an example of a vestigial structure. Vestigial structures are remnants of features that served a function in ancestral species but have lost their original purpose in modern organisms. The human tailbone, along with other structures like the appendix, exemplifies this concept within evolutionary biology.
;