Embryo development is a crucial step for ensuring the survival of any species. The initial development is similar for both vertebrates and invertebrates. As the embryo continues to develop, the specific characteristics of the species start emerging at different stages. The nerve cord, notochord, postnatal tail, and pharyngeal slits are the four characteristics that are present in the chordates. The neural crest is the feature that is present in all the vertebrates such as birds, mammals, and reptiles.

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Chapter 51, Problem 10TY

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Introduction: Embryo development is a crucial step for ensuring the survival of any species. The initial development is similar for both vertebrates and invertebrates. As the embryo continues to develop, the specific characteristics of the species start emerging at different stages. The nerve cord, notochord, postnatal tail, and pharyngeal slits are the four characteristics that are present in the chordates. The neural crest is the feature that is present in all the vertebrates such as birds, mammals, and reptiles.

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