In humans, the pelvis and femur, or thigh bone, are involved in walking. In whales, the pelvis and femur shown in Figure 15–1 are

Question

Question 5 options:

fossils that contain genetic mutations.

acquired traits necessary for an organism's survival.

examples of natural variation

vestigial structures that may have had an important function in the past

Answer 1

vestigial structures that may have had an important function in the past