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Pre-Test
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1
Virtually all of the major groups of animals that survive at the present time originated at the beginning of the
A)Cenozoic era.
B)Mesozoic era.
C)Paleozoic era.
D)Certaceous period.
2
A characteristic of the sharks is
A)an operculum.
B)a cartilaginous skeleton.
C)a swim bladder.
D)All of the above
3
A characteristic shared by all mammals is
A)mammary glands.
B)giving birth to live young.
C)hooves.
D)pouches.
4
Which of the following have moist skin that is susceptible to water loss?
A)Mammals
B)Birds
C)Amphibians
D)Reptiles
5
A swim bladder allows a fish to
A)regulate its water content in seawater.
B)regulate its salt content in seawater.
C)regulate its salt content in freshwater.
D)control its buoyancy in water.
E)tolerate changes in water pressure.





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