Question

structures with the same parts have different functions; suggests that organisms share a common ancestry
fossil
homologous structures
adaptive radiation
vestigial structures

Explanation:

To solve this, we analyze each option:

• "fossil": Remains of organisms, not about structural similarity. Eliminate.
• "homologous structures": Defined as structures with same parts (anatomical similarity) but different functions, indicating common ancestry. Matches the description.
• "adaptive radiation": Evolution of diverse species from a common ancestor, not about structural parts. Eliminate.
• "vestigial structures": Reduced, non - functional structures, not about same parts with different functions. Eliminate.

Answer:

B. homologous structures