Question

In humans, the pelvis and femur are involved in walking. In whales, the pelvis and femur shown in figure 2 are:a) vestigial structuresb) acquired structuresc) examples of fossilsd) examples of natural variation

Answer 1

Whales are adapted to marine life and are no longer able to walk on firm land. This means that the pelvis and femur are no longer needed and thus they eventually atrophied.

These kinds of structures, that have lost their original function, are known as vestigial structures.

This means A, vestigial structures, is the right answer.