Listed below are characteristics that serve as evidence of shared ancestry to see between fish and reptiles. The option that applies only to embryos rather than adults?
The characteristic that applies only to embryos rather than adults as evidence of shared ancestry between fish and reptiles is the presence of gill slits. Embryos of both fish and reptiles initially develop gill slits, although they serve different functions in later stages of development. For fish, gill slits are essential for respiration in water, while in reptile embryos, these slits are involved in the development of structures such as jaws and ears. This shared ancestral feature in embryonic development suggests a common evolutionary history between fish and reptiles.
