Final answer:
By observing embryos from similar-looking species during their early development, we can conclude that those organisms share a common ancestor.
Step-by-step explanation:
By observing embryos from two species that are similar in appearance during their early development, we can conclude that those organisms share a common ancestor. Similarities in appearance suggest that the organisms have inherited similar traits from their common ancestor. This is known as embryological homology.
Learn more about Embryological homology