An evidence of a common ancestral for fishes, amphibians, reptiles, birds and mammals is the
The evidence for a common vertebrate ancestor includes similarities in embryonic development (like gill slits and tails), shared anatomical features, and fossil evidence, all pointing to a shared evolutionary history.
Vertebrate embryos, even those of different species, exhibit striking similarities in their early stages, including the presence of gill slits (pharyngeal pouches) and a tail, even if these features are later lost in the adult form.
Comparative embryology as a field of study highlights the similarities in the early development of different vertebrate species, suggesting a common ancestor from which these features were inherited. For example, all vertebrate embryos have gill slits and tails, which are later lost in some species, such as humans, where the tail is reduced to the tailbone.
There is an explanation video available below.
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