Which characteristic differentiates hagfishes from other craniates?
A) Two-chambered hearts
B) Skeletal elements surrounding the nerve cord
C) Lobe-like fins
D) Bony jaws
E) A lack of gills
Correct Answer:
Verified
Q6: The earliest vertebrates lacked
A) gills.
B) jaws.
C) skeletons.
D)
Q7: _have a dorsal nerve cord.
A) Starfishes
B) Bugs
C)
Q8: All chordates have
A) a backbone.
B) gills.
C) a
Q9: The great size and mobility of the
Q10: Which of the following best describes which
Q12: The notochord
A) forms the nerve cord in
Q13: Lancelets live in
A) sulfur springs.
B) the sea.
C)
Q14: At some stage of the life cycle,
Q15: The discovery of a coelacanth in South
Q16: Which of the following features is absent
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