The parasitic lampreys, living members of the ____ lineage, have shards of cartilage that partially cover the nerve cord, which may represent an early stage of the evolution of vertebrae.
A) Petromyzontoidea
B) Placodermi
C) Cephalochordata
D) Urochordata
E) Myxinoidea
Correct Answer:
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Q25: The living members of the _ lineage,
Q26: Several lineages of extinct _ were jawless
Q27: Which lineage has the largest number of
Q28: Living members of the _ lineage have
Q29: Living members of the _ lineage include
Q31: Which structure is a covering for the
Q32: Fossil tooth parts of extinct _ suggest
Q33: Two extant species of coelacanths and six
Q34: A key trait that distinguishes gnathostomes from
Q35: Which structure is derived from an ancestral
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