The correct answer to this question is "b)That our early ancestors were tailed primates." An elongated tailbone occurs rarely in some newborn children. The presence of a tailbone indicate is that t<span>hat our early ancestors were tailed primates. </span>
The correct answer is option b) "That our early ancestors were tailed primates".
Explanation:
Rarely, some newborn children developed an elongated coccyx, known as an elongated tailbone or a pseudotail. This is an example of vestigiality, which is the presence of ancient body structures that do not longer serve a purpose. In this case, vestigial tails indicate that our early ancestors were tailed primates. Other examples of human vestigiality include wisdom teeth, appendix, and body hair.
They are useful as they can predict the genetic probability of a particular phenotype arising in a couple's offspring. In other words, it can tell you if you will or will not have a certain trait.