What feature is characteristic of Phylum Chordata, present in the woodchuck during development?

Answer

A notochord.

Phylum Chordata is defined by the presence of features like a notochord, a dorsal hollow nerve cord, and pharyngeal slits at some stage of life, most notably during embryonic development in mammals.

What feature is characteristic of Phylum Chordata, present in the woodchuck during development?
animalmammalclassificationrodentwoodchuck