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Shark characteristics include having internal fertilization. having isosmotic blood (compared to that of marine water)due to high concentrations of urea and trimethylamine oxide. having teeth of modified placoid scales. being able to detect bioelectric fields. __ Having a swim bladded to control buoyancy

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The large spiracles on the top of the head of skates and rays is for


A) air intake for respiration.
B) water intake to prevent clogging the gills.
C) detection of bioelectric fields from prey buried in the sea bottom.
D) detection of chemical odors in the water.

E) C) and D)
F) B) and D)

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Compare the swimming mechanisms of invertebrates such as cnidarians,platyhelminthes,and annelids with those of the fishes.Is one form superior to another? Why or why not?

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The swimming mechanisms of invertebrates...

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Of what significance is it that gill supports immediately behind the jaws of sharks are hinged like jaws and serve to link the jaws to the braincase?

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The significance of the gill supports, k...

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The chimaera


A) include representatives called ratfish and ghostfish.
B) have an odd mixture of shark-like and their own unique characteristics.
C) were more common in the Cretaceous than they are now.
D) have the upper jaw fused to the cranium.
E) All of the choices are correct

F) C) and E)
G) A) and E)

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