All Chordates Have

Q19: The urochordates are<br>A)called tunicates.<br>B)marine animals.<br>C)sessile as adults,but

Q20: Development of the vertebrate head and sense

Q21: The name Urochordata means literally<br>A)"tail chordates."<br>B)"head chordates."<br>C)"kidney

Q22: Unlike most invertebrate phyla,the nerve cord of

Q23: One example of why a cladist is

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 _.