The Development of a New Vertebrate Head Was Largely the Result

Q26: The perforated pharynx of chordates first evolved

Q27: The closest model for the vertebrate ancestral

Q28: "Sea squirts," the most common kind of

Q29: Lancelets belong to the subphylum _.

Q30: Explain why fossil specimens of Haikouella lanceolata

Q32: Although several invertebrate groups have been proposed

Q33: A notochord is most correctly defined as<br>A)a

Q34: Appendicularians<br>A)are sexually mature individuals that have retained

Q35: While several invertebrate groups (phyla)have in the

Q36: Pikaia gracilens,the earliest known chordate collected from