Question

Whales have what seem like remnants of a pelvis and femur, as shown here.

What are these structures an example of?
transitional structures
analogous structures
vestigial structures
adapted structures

Answer 1

vestigial structures

Step-by-step explanation:

Answer 2

vestigial structures

Step-by-step explanation:

A "vestigial structure" or "vestigial organ" is an anatomical feature or behavior that no longer seems to have a purpose in the current form of an organism of the given species. Often, these vestigial structures were organs that performed some important functions in the organism at one point in the past.