While several invertebrate groups (phyla)have in the past been proposed as chordate ancestors,embryological evidence indicates the chordates are most probably a sister group to the _____________.
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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
Q27: Development of the vertebrate head and sense
Q29: Lancelets belong to the subphylum _.
Q30: The skeletal rod found in all chordates
Q31: The lancelet reproduces
A)by asexual processes alone.
B)by budding.
C)sexually
Q32: "Sea squirts," the most common kind of
Q33: Pikaia gracilens,the earliest known chordate collected from
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