Question

The diagram shows a chicken embryo and a human embryo.



Which is best supported by the diagram?

Because their embryos have tails, chickens and humans do not likely share a common ancestor with fish.
Because their embryos have structures similar to gills, chickens and humans likely share a common ancestor with fish.
Chickens and humans have homologous structures as embryos, so they are not likely related to each other.
Chickens and humans have homologous structures as embryos, so they are not likely related to any other organisms.

Answer 1

Because their embryos have structures similar to gills, chickens and humans likely share a common ancestor with fish.

The gill-like pharyngeal pouches and other early embryonic similarities are homologous features that suggest common ancestry with fishes.