which type of structure shows common ancestry?\n\nanalogous structures\n\nhomologous structures

Brief Explanations:

Homologous structures are organs or skeletal elements of animals and organisms that, by virtue of their similarity, suggest their connection to a common ancestor. These structures do not necessarily have to look exactly the same or have the same function; however, they are structurally similar because they evolved from the same ancestral source. In contrast, analogous structures are features that perform similar functions but evolved independently (convergent evolution) and do not indicate a common evolutionary origin.

Answer:

Homologous structures