Question

Some species of modern whales have hind leg bones not visible from the outside and completely covered by skin. Which of the following best predicts what a scientist would find looking at whale fossils?
A. The hind leg bones are larger in the oldest fossils of whales.
B. The hind leg bones are smaller in the oldest fossils of whales.
C. The hind legs are totally absent in the oldest fossils of whales.
D. The hind leg bones are the same size in the oldest fossils of whales.