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American Public University SCIN 401 Ch

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American Public University

SCIN 401

Ch. 7

Question1)The primary diference(s) between Asian elephants and African elephants is(are) that

 

 

A.            Asian elephants have smaller ears.

B.            African elephants have 21 ribs instead of 19 ribs.

C.            Asian elephants have flattened forehead.

D.            African elephants highest point is the shoulders.

 

E.            All of the above.

 

 

Question 2

Which best describes eutherian mammals?

 

 

A.            Eutherian mammals have more species than metatherian mammals.

 

B.            Currently, the oldest known eutherian mammal fossil is from China and named <i>Eomaia scansoria</i>.

C.            Molecular phylogenetics suggests a single radiation of eutherian mammals.

D.            During the Cenozoic era eutherian mammals dominated all continents.

 

E.            A and B.

F.            All of the above.

 

 

Question 3

Tenrecs are unique in their body temperature regulation which fluctuates. This type of thermoregulation is called:

 

 

A.            homothermic

 

B.            heterothermic

C.            synathermic

D.            ectothermic

 

 

Question 4

The "scales" of pangolins are composed of

 

 

A.            bony shutes.

 

B.            agglutinated hair.

C.            hardened skin cells.

D.            modified appendages.

 

 

Question 5

Why are manatee cheek teeth pushed forward and replaced?

 

A.            In order to replace front cheek teeth that wear out from eating highly abrasive grasses.

B.            In order to replace front cheek teeth that wear out from eating hard bivalves such as mussels and clams.

C.            It is a vestigial characteristics from Cretaceous ancestors.

D.            It is a shared characteristic with Australian rick wallaby.

 

 

Question 6

Match the taxonomic group with the correct list of representative species.

2.            Afrosoricida F. golden moles, tenrec, otter shrews

3.Macroscelidea A. sengis

4.Tubulidentata G. aardvarks

5.Proboscidea H. elephants

6.Sirenia C. manatees and dugongs

7.Hyracoidea B. hyraxes

1.Cingulata E. armadillos

9.Pilosa I. anteaters, sloths, and tamanduas

8.Pholidota D. pangolins

 

 

 

 

Question 7

The manatee is a listed endangered species in the United States. What is not considered a cause of manatee endangerment?

 

 

A.            Epizootic infections caused by excess fertilizer induced dinoflagellate blooms.

B.            Boat propellers.

C.            Low reproductive rate.

 

D.            Early age at first reproduction.

 

Question 8

Which of the following are thought to be adaptions for termite and ant feeding in aardvarks?

 

 

A.            Dentition simplification.

B.            Long sticky tongues.

C.            Long pinnae for enhanced auditory detection.

 

D.            A and B.

E.            All of the above.

 

 

Question 9

Which xenarthan group contains the most generalized species in terms of feeding habit and locomotion?

 

 

A.            Family Cyclopedidae

B.            Family Manidae

 

C.            Family Dasypodidae

D.            Family Myrmecophaidae

 

 

Question 10

 

 

 

According to this partial cladogram, what group is most closely related to manatees?

 

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A.            Elephants.

 

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B.            Hyraxes.

 

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C.            Aardvarks.

 

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D.            Tree Shrews.

 

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E.            None of the above.