Question

homologous
vestigial
analogous

Explanation:

The image shows a whale with a small, non-functional pelvic/leg structure. Vestigial structures are remnants of body parts that had a function in ancestral organisms but are no longer functional in the current organism. Homologous structures share a common embryonic origin but may have different functions, while analogous structures have similar functions but different origins. The whale's reduced leg structure fits the definition of a vestigial trait.

Answer:

Vestigial