Explain Why Fossil Specimens of Haikouella Lanceolata Offer Many Clues

Q25: The ostracoderms<br>A)are the adult form of the

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 _.

Q31: The development of a new vertebrate head

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