Nhận biết (M1)

The oceanic whitetip shark and the Pacific halibut are ectothermic (cold-blooded) fish, whereas the

shortfin mako shark and the yellowfin tuna are regional endotherms—they retain metabolic heat resulting

in body temperatures above the ambient water temperature. Modeling the effect of falling ambient

temperatures on ectotherms indicated to researchers Haley R. Dolton and colleagues that ectotherms’

body temperatures inexorably decrease toward the ambient temperature. Data from wild basking sharks

show that even though their body temperature consistently remains 1.0 to 1.5°C above ambient, it also

declines as the ambient temperature falls. This suggests that the body temperatures of the _____.

Which choice most logically completes the text?

• A.

  Yellowfin tuna and the shortfin mako shark are likely to be more variable than the body temperature of

• B.

  Basking shark and the shortfin mako shark remain fixed even as ambient water temperature changes,

• C.

  Basking shark and the yellowfin tuna remain fixed even if the ambient water temperature changes,

• D.

  Pacific halibut and the basking shark are at least partly determined by the ambient water.