At some stage of the life cycle, all chordates have:
A) an external skeleton.
B) a ventral nerve cord.
C) a pre-anal tail.
D) pharyngeal gill slits.
E) a backbone.
Correct Answer:
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Q10: Which characteristic differentiates hagfishes from other craniates?
A)skeletal
Q11: Which of the following has a ventral
Q12: Larval sea squirts:
A)live in fresh water.
B)display all
Q13: In all chordates, the notochord:
A)appears only in
Q14: In vertebrates, the notochord is replaced by:
A)jaws.
B)a
Q16: The great size and mobility of the
Q17: Which of the following features is absent
Q18: _ have a dorsal nerve cord.
A)Sharks
B)Bugs
C)Starfishes
D)Leeches
E)Earthworms
Q19: A tunicate is a(n):
A)bony fish.
B)cartilaginous fish.
C)jawless fish.
D)amphibian.
E)invertebrate
Q20: The earliest vertebrates lacked:
A)a notochord.
B)gills.
C)jaws.
D)brains.
E)skeletons.
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