Boa constrictors have tiny pelvic girdles and leg bones inside their bodies. Because these structures are nonfunctional "evolutionary baggage," they are called:

Question

Quizplus · Accepted Answer

The term "vestigial" is commonly used to describe structures that have lost their original function through evolution and are now considered useless or nonfunctional. The tiny pelvic girdles and leg bones inside boa constrictors fit this description and are considered vestigial structures.

Boa Constrictors Have Tiny Pelvic Girdles and Leg Bones Inside