In both tunicates and cephalochordates,the ventral side of the branchial sac contains a ciliated,mucus-secreting groove,the ____________.
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Q20: Salps in the class Thalacea
A)are barrel-shaped open-ocean
Q21: The urochordates are enclosed in a nonliving
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
Q26: The ostracoderms
A)are the adult form of the
Q27: Development of the vertebrate head and sense
Q28: While several invertebrate groups (phyla)have in the
Q29: Lancelets belong to the subphylum _.
Q30: The skeletal rod found in all chordates
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