Which of the following features is absent in lancelets?
A) nerve cord
B) backbone
C) notochord
D) gill slits
E) tail
Correct Answer:
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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
Q15: At some stage of the life cycle,
Q16: The great size and mobility of the
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.
Q21: Fins composed of rod-shaped bones surrounded by
Q22: Lungfishes are classified as:
A)amphibians.
B)lobe-finned fishes.
C)jawless fishes.
D)ray-finned fishes.
E)cartilaginous
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