Final answer:
DNA does not provide evidence of common ancestry; embryology, analogous structures, and homologous structures do.
Step-by-step explanation:
The factor that does NOT provide evidence of common ancestry is DNA. DNA is a genetic material that carries the hereditary information of an organism, but it can be influenced by other factors such as mutations, gene transfer, and natural selection. While DNA analysis can help determine evolutionary relationships, it is not the sole factor that provides evidence of common ancestry.
In contrast, embryology, analogous structures, and homologous structures are all examples of evidence of common ancestry. Embryology studies the development of embryos across different species, revealing similarities in early developmental stages. Analogous structures perform similar functions but have different evolutionary origins, while homologous structures share a common evolutionary origin but may have different functions. These similarities in development and structures indicate a common ancestry.
Learn more about evidence of common ancestry