The urochordates are enclosed in a nonliving cellulose-containing structure called a _________ or test.
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Q16: The name Urochordata means literally
A)"tail chordates."
B)"head chordates."
C)"kidney
Q17: The phylum Urochordata includes the classes
A)Ascidiacea,Cephalaspidomorphi,and Myxini.
B)Appendicularia,Cephalochordacea,and
Q18: The perforated pharynx of chordates first evolved
Q19: A notochord is most correctly defined as
A)a
Q20: Salps in the class Thalacea
A)are barrel-shaped open-ocean
Q22: Of the five chordate hallmarks,adult tunicates have
Q23: Unlike most invertebrate phyla,the nerve cord of
Q24: The lancelets or Branchiostoma are found
A)very rarely
Q25: In both tunicates and cephalochordates,the ventral side
Q26: The ostracoderms
A)are the adult form of the
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