Which of the following acts through a secondary messenger?
A) epinephrine
B) glucagon
C) luteinizing hormone
D) all of these
D
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How does the character of a rock influence weathering?
A) Fractures and other discontinuities block the entry of water into a rock and so make the rock more resistant to weathering. B) Minerals that are soluble can be dissolved and reprecipitated and so are resistant to weathering. C) Rocks that are broken have more surface area and so weather faster. D) Rocks that are easily weathered and eroded generally form steep cliffs. E) None of these are correct.
A closed system is not amenable to scientific scrutiny
Indicate whether the statement is true or false
Which of the following accounts for the flow of oxygen into the alveoli?
A) Hemoglobin transports the O2 into the alveoli. B) Myoglobin transports the O2 into the alveoli. C) The O2 pressure in the alveoli is higher than that in the inhaled air. D) The O2 pressure in the alveoli is lower than that in the inhaled air.
In tropical rainforest climates the daily range of temperature is often greater than the annual range of temperature
a. True b. False Indicate whether the statement is true or false