Our knowledge of the fossil invertebrate chordates is quite limited because
A) they were very rare.
B) they were soft-bodied.
C) fossils from that period were obliterated by volcanism.
D) they were only freshwater.
Fill in the Blank Questions
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Q23: Unlike most invertebrate phyla,the nerve cord of
Q25: In primitive vertebrates,the notochord functions in
A)sensory reception.
B)coelom
Q27: In both tunicates and cephalochordates,the ventral side
Q29: The _ were jawed fishes which lived
Q29: Lancelets belong to the subphylum _.
Q31: The most likely candidate for the vertebrate
Q32: "Sea squirts," the most common kind of
Q32: Of the four chordate hallmarks,adult tunicates have
Q34: Fossils known as _ are very useful
Q35: The post anal tail is seen in
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