21.The structure used to amplify an elephant seal bull's roar is a(n): A.inflated proboscis. B.hallow tusk used as a horn. C.sirenaphores. D.blowhole. E.melon. 22.The entertaining seals of marine attraction parks are: A.sea…

 

 

21.The construction used to amplify an elephant seal bull’s roar is a(n):

A.inflated proboscis.

B.hallow tusk used as a horn.

C.sirenaphores.

D.blowhole.

E.melon.

22.The entertaining seals of marine attraction parks are:

A.sea lions.

B.harbor seals.

C.elephant seals.

D.fur seals.

E.harp seals.

23.Manatees and dugongs belong to the order:

A.Pinnipedia.

B.Cetacea.

C.Carnivora.

D.Sirenia.

E.Fissipedia.

24.The sirenians:

A.relaxation on shore.

B.bear younger on land.

C.are fully aquatic.

D.are fish eaters.

E.don’t have blubber since they dwell in tropical water.

25.The next are all variations between manatees and dugongs besides:

A.contemporary and seawater habitat for manatees, dugongs solely dwell in seawater.

B.dugongs have a bigger head.

C.dugongs have a shorter flipper.

D.manatees’ forelimbs type flippers, dugongs’ don’t.

E.None of those.

26.The next are all similarities between manatees and dugongs and whales besides:

A.streamlined, virtually hairless our bodies.

B.forelimbs modified to type flippers.

C.tail flukes.

D.devour macrophytes.

E.None of those.

27.Manatees are principally present in:

A.chilly polar waters.

B.Antarctica.

C.tropical estuaries.

D.temperate coastal areas.

E.Japanese Pacific Ocean.

28.The best menace to the Florida manatees is:

A.lack of habitat.

B.human predation.

C.being mauled or killed by boats.

D.stranding in thermal plumes of energy crops.

E.illness from city runoff.

29.Manatees feed totally on:

A.small fishes.

B.benthic invertebrates.

C.plankton.

D.aquatic crops.

E.different marine mammals.

30.Whales, dolphins, and porpoises all belong to the order:

A.Sirenia.

B.Cetacea.

C.Carnivora.

D.Pinnipedia.

E.Fissipedia.

 

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