Question

question 15 of 25
which is an example of a vestigial structure?
a. whale pelvis bone
b. fish gills
c. human arm
d. raccoon tail

Explanation:

Vestigial structures are remnants of organs or structures that had a function in an early ancestor. Whales evolved from land - dwelling ancestors. The pelvis bone in whales is a vestigial structure as it no longer serves the function (like supporting legs for walking on land) that it did in their terrestrial ancestors. Fish gills are functional for respiration in water. The human arm is functional for grasping, lifting, etc. The raccoon tail is functional for balance, communication, etc.

Answer:

A. Whale pelvis bone