Unlike most invertebrate phyla,the nerve cord of chordates is single,tubular,and located ___________ to the alimentary canal.
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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
Q21: The urochordates are enclosed in a nonliving
Q22: Of the five chordate hallmarks,adult tunicates have
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
Q27: Development of the vertebrate head and sense
Q28: While several invertebrate groups (phyla)have in the
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