The ostracoderms
A) are the adult form of the ammocoete.
B) were the first vertebrate to have jaws.
C) are an extinct group of heavily armored,jawless fish.
D) were the first fish with paired fins that led to paired appendages.
E) were the first jawed animals.
Correct Answer:
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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
Q25: In both tunicates and cephalochordates,the ventral side
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
Q31: The lancelet reproduces
A)by asexual processes alone.
B)by budding.
C)sexually
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