The great size and mobility of the vertebrates are associated with:
A) four-chambered hearts.
B) lungs used for respiration.
C) lightweight endoskeletons.
D) uterine development of offspring.
E) increased brain size and complexity.
Correct Answer:
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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
Q15: At some stage of the life cycle,
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.
Q21: Fins composed of rod-shaped bones surrounded by
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