Final answer:
Homologous structures are shared physical features and genomes that indicate closer evolutionary relationships between organisms. Examples of homologous structures include the bones in bat and bird wings.
Step-by-step explanation:
Organisms that share similar physical features and genomes are more closely related than those that do not. We refer to such features that overlap both morphologically (in form) and genetically as homologous structures. These structures stem from developmental similarities based on evolution. For example, the bones in bat and bird wings have homologous structures.