Which of the following is an example of a vestigial organ that could be found in a transitional fossil? (1 point)
a) Pelvic girdle in a whale ancestor.
Explanation: The pelvic girdle in whales is an example of a vestigial organ as it is present in whale ancestors but has no functional use in modern whales, which have adapted to their aquatic lifestyle. A transitional fossil might preserve this vestigial organ as it would correspond to an intermediate stage between land-living ancestors and fully aquatic whales.