In a cold environment, the body produces and conserves heat through all of the following mechanisms, EXCEPT:
A) shivering.
B) vasoconstriction.
C) hyperventilation.
D) thermogenesis.
Answer: C) hyperventilation.
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Mollusks and crustaceans are most likely to live in the ________ zone of a lake
A) littoral B) limnetic C) profundal D) neritic
Crops grown in the mixed crop and livestock region are used primarily to feed animals
Indicate whether the statement is true or false.
Which of the following produces a tidal current?
A) Both ebb tides and flood tides B) Both neap tides and spring tides C) Ebb tide D) Flood tide E) Spring tide
Ocean acidification is taking place as the oceans absorb some of the additional carbon dioxide in the atmosphere. What is the basic environmental problem that this creates?
A. causes the oceans to become even more saline, thereby reducing ocean circulation. B. more difficult for marine organisms to secret their own protective shells. C. increases the rate of evaporation of seawater. D. makes it unsafe for humans to go swimming in the ocean. E. all of the answers listed here.