Why does a chick and a pig embryos have many features in common?

Chick and pig embryos share many features in common due to their evolutionary ancestry and the fundamental similarities in vertebrate development. Both species are part of the larger group of animals known as chordates, which exhibit similar embryonic structures, such as pharyngeal arches, that reflect common developmental pathways. Additionally, these shared features arise from the conserved genetic and molecular mechanisms that guide the early stages of embryogenesis across different vertebrate species.